Guitar amplifier and control method of guitar amplifier

Abstract

The present invention provides a guitar amplifier and a control method for the guitar amplifier, which can easily change settings for a special performance mode without interrupting the sound. The guitar amplifier processes input musical sound and outputs the sound. The guitar amplifier includes: a storage device storing a plurality of information sets including setting values ​​for one or more musical sound processing used in the special performance mode; and a control device that, upon input of information indicating the activation of a special performance mode to which an information set selected from the plurality of information sets is applied, changes the settings of the one or more musical sound processing to settings based on the setting values ​​of the selected information set.

Description

Technical Field

[0001] The present invention relates to a guitar amplifier and a control method of the guitar amplifier. Background Art

[0002] Conventionally, there are guitar amplifiers that can switch effect settings by switching channels using a foot switch (see, for example, Patent Document 1). Furthermore, there are guitar amplifiers that include at least one analog channel and an electronic memory capable of automatically storing parameter values ​​for at least one channel. The electronic memory sets parameter values ​​for delay, echo, chorus, flanger, tremolo, treble, midrange, bass, channel volume, and overall volume (see, for example, Patent Document 2).

[0003] [Prior art literature]

[0004] [Patent Document]

[0005] [Patent Document 1] Japanese Patent No. 5308340

[0006] [Patent Document 2] Japanese Patent Publication No. 2008-511029 Summary of the Invention

[0007] [Problems to be solved by the invention]

[0008] An object of the present invention is to provide a guitar amplifier that can easily change settings to a special performance mode without interrupting the sound.

[0009] [Technical means to solve the problem]

[0010] One embodiment of the present invention is a guitar amplifier that processes input musical sounds and outputs the processed musical sounds. The guitar amplifier includes:

[0011] a storage device storing a plurality of information sets, each of which includes setting values ​​for one or more musical tone processing used in a special performance mode; and

[0012] The control device changes the settings of the one or more musical sound processing to settings based on the setting values ​​of the selected information set when information indicating that the special performance mode to which the information set selected from the plurality of information sets is applied is input.

[0013] Furthermore, embodiments of the present invention may also include a control device for a guitar amplifier, a control method for a guitar amplifier, a program for controlling a guitar amplifier, and the like.

[0014] Another embodiment of the present invention is a control method for a guitar amplifier, which processes input musical sound and outputs the processed musical sound. The control method for the guitar amplifier includes:

[0015] storing a plurality of information sets including setting values ​​for one or more musical tone processing used in a special performance mode; and

[0016] When information indicating that the special performance mode to which an information set selected from the plurality of information sets is turned on is input, settings of the one or more musical sound processes are changed to settings according to setting values ​​of the selected information set. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 A guitar amplifier according to an embodiment is shown.

[0018] Figure 2 This shows the circuit structure of a guitar amplifier.

[0019] Figure 3A and Figure 3B This figure shows the circuit structure of the foot controller.

[0020] Figure 4 This is an illustration of a patch.

[0021] Figure 5 This example shows the behavior of a boost.

[0022] Figure 6 This diagram explains the gain changes and effect (delay) associated with turning the solo function on and off.

[0023] Figure 7 This is a diagram explaining the mute operation when switching patches.

[0024] Figure 8 Indicates the on / off structure of a switch.

[0025] Figure 9A 、 Figure 9B and Figure 9C This is an illustration of operations using the foot controller.

[0026] Figure 10 This is a flowchart showing an example of processing in the guitar amplifier.

[0027] Figure 11 This is a flowchart showing an example of processing in the guitar amplifier.

[0028] Figure 12 This is a flowchart showing an example of processing in the foot controller.

[0029] Figure 13 This is a flowchart showing an example of processing in the foot controller.

[0030] [Explanation of Symbols]

[0031] 10: Guitar Amplifier

[0032] 11: CPU

[0033] 12: ROM

[0034] 13: RAM

[0035] 15: DSP

[0036] 30: Foot controller DETAILED DESCRIPTION

[0037] The guitar amplifier of the embodiment is a device that processes input musical sound and outputs the processed musical sound, and can have a configuration including the following devices.

[0038] (1) A storage device storing a plurality of information sets including setting values ​​for one or more musical tone processing used in a special performance mode.

[0039] (2) The control device changes the settings of one or more musical sound processing to settings according to the setting values ​​of the selected information set when information indicating that a special performance mode to which an information set selected from a plurality of information sets is applied is input.

[0040] According to the guitar amplifier of the embodiment, it is possible to easily configure settings for special performance modes without interrupting the sound. A special performance mode is, for example, solo mode. During a band performance, when a guitarist plays a solo part, they may wish to perform the solo part with the guitar amplifier in a different state (settings) than when playing with accompaniment. In the embodiment, multiple information sets can be stored, allowing the guitar amplifier's settings to be easily changed to those for solo mode. These information sets include setting values ​​for one or more musical sound processing when using solo mode. Furthermore, multiple settings for solo mode can be prepared.

[0041] The guitar amplifier of the embodiment may be configured such that, upon input of information indicating that the special performance mode is off, the control device changes the settings of one or more musical sound processing to predetermined settings regardless of the setting values ​​in the selected information set.

[0042] In the guitar amplifier of the embodiment, a configuration may be employed in which the setting values ​​included in the information set indicate the need for one or more musical sound processing. In this case, the need for one or more musical sound processing may be selected from one or more of the following: the need for using a booster, the need for changing gain in response to turning on / off a special performance mode, the need for using an external device, the need for applying an effect using an effector, the need for using an equalizer, and the need for changing the volume. However, the need for musical sound processing is not limited to the examples described above. The need for musical sound processing may also be, for example, the need for turning on / off a musical sound processing circuit that performs each musical sound processing.

[0043] In the guitar amplifier of the embodiment, a configuration may be employed in which the control device performs a fade process when switching the signal path for musical sound processing in conjunction with switching of the information set used in the special performance mode. This can avoid the occurrence of interrupted or abnormal sounds caused by switching the signal path.

[0044] In the guitar amplifier of the embodiment, the control device may be configured such that, while any one of the plurality of information sets is selected, the control device receives input information indicating selection of an information set identical to the selected information set as information indicating on / off of a special performance mode to which the selected information set is applied, and receives input information indicating selection of an information set different from the selected information set as an instruction to change selection to the different information set. In this case, the guitar amplifier of the embodiment may be configured such that, while any one of the plurality of information sets is selected, the control device receives input information indicating selection of an information set different from the selected information set as an instruction to change selection to the different information set, and changes the settings of one or more musical sound processing used in the special performance mode based on the setting values ​​included in the different information set.

[0045] In the guitar amplifier of the embodiment, a configuration may be employed in which the control device performs a muting process when changing the settings of one or more musical sound processing. This can prevent the generation of unusual sounds. A configuration may be employed in which the one or more musical sound processing is arbitrarily selected from among boost, gain, use of external devices, application of effects using an effects processor, equalizer, and volume change. However, the types of musical sound processing are not limited to the examples described above. Multiple boost processes with different operating characteristics may be prepared as boosts. The effects applied by the effects processor may be delay, vibrato, chorus, or the like, regardless of their type.

[0046] The guitar amplifier of the embodiment may also include a foot controller for inputting information indicating selection of an information set, information indicating turning on or off a special performance mode, and information indicating turning off or on a special performance mode. By using the foot controller, the selection of a solo mode or turning it on or off can be controlled without using the hands during guitar playing.

[0047] The following structure can also be adopted: when a foot controller is used, it includes multiple buttons corresponding to the multiple information sets respectively. When any one of the multiple information sets has been selected, the button corresponding to the selected information set acts as a button for inputting information indicating the on or off of a special performance mode to which the selected information set is applied, and buttons other than the button corresponding to the selected information set, when pressed, act as buttons for switching the corresponding information set to the selected information set.

[0048] Hereinafter, embodiments will be described with reference to the accompanying drawings. The configurations of the embodiments are merely illustrative and are not intended to limit the present invention. Figure 1 The guitar amplifier 10 is connected to an electric guitar 1, processes the musical sound of the electric guitar 1 input as input musical sound to the guitar amplifier 10, amplifies the sound by a power amplifier, and then emits (outputs) the sound from a speaker.

[0049] The guitar amplifier 10 has an on / off function for a solo (SOLO) function, and the guitar amplifier 10 can have different settings when the solo function is on and when it is off. When the solo function is on, it is called solo mode. The solo mode is an example of a special performance mode, but the special performance mode is not limited to the solo mode. In this embodiment, four information sets (called patches) can be pre-registered for the guitar amplifier 10, and the information sets include one or more musical sound processing used when the solo mode is on, and setting values ​​for each musical sound processing. The number of patches that can be registered can be more than four or less than four. In this embodiment, the patches include information on musical sound processing circuits that perform one or more musical sound processing used in the solo mode, and setting values ​​indicating the on / off state of each musical sound processing circuit.

[0050] Figure 2 1 is a diagram showing an example of a circuit configuration of a guitar amplifier 10. Figure 2 Guitar amplifier 10 includes a central processing unit (CPU) 11 that controls overall operation. CPU 11 is connected to a read-only memory (ROM) 12, a random access memory (RAM) 13, a universal asynchronous receiver / transmitter (UART) 14, and a digital signal processor (DSP) 15 via a bus 2. CPU 11 is also connected to a user interface (UI) 16.

[0051] The RAM 13 is used as an operating area for the CPU 11 and as a storage area for programs and data. The ROM 12 is used as a storage area for programs and data. The RAM 13 and ROM 12 are examples of storage devices (storage media) and store multiple information sets (information indicating patches). The UART 14 is used for communication with the foot controller 30.

[0052] Guitar amplifier 10 includes an input terminal 21, a send terminal 22, and a return terminal 23. An electric guitar 1 is connected to input terminal 21, which receives an electrical signal (musical sound signal) generated by playing the electric guitar 1. Send terminal 22 is used to transmit the musical sound signal to an external device (e.g., an external effects pedal), and return terminal 23 is used to receive a musical sound signal output from the external device.

[0053] The musical sound signal input to the input terminal 21 and the return terminal 23 undergoes analog-to-digital conversion via the ADC 17 and is then input to the DSP 15. The DSP 15 controls the pitch, filtering, amplification, and effects of the signal received from the electric guitar 1. The musical sound signal output from the DSP 15 is input to a digital-to-analog converter (DAC) 18, where it is converted into an analog signal and sent to the output terminal 22 and the power amplifier 19. The power amplifier 19 amplifies the signal and connects it to the speaker 20, which then emits musical sound corresponding to the musical sound signal.

[0054] The UI 16 includes input devices such as knobs, switches, displays (lamps, light-emitting diodes (LEDs)), buttons, and keys for setting various setting values ​​(parameters) for the guitar amplifier 10, and a display for displaying the status of the guitar amplifier 10 or the settings.

[0055] The CPU 11 executes programs to store information about multiple patches created using the UI 16 in the RAM 13, receive information indicating patch selection or the activation of the solo function (solo mode), etc. When the activation of the solo mode is received, the CPU 11 causes the DSP 15 to operate as a circuit group corresponding to the selected patch.

[0056] Figure 3A This figure shows an example circuit configuration of the foot controller 30. The foot controller 30 includes a CPU 31, and ROM 32, RAM 33, and UART 34 connected to the CPU 31 via a bus 37. ROM 32 is used as a storage area for programs and data. RAM 33 is used as an operation area for the CPU 31 and as a storage area for programs and data. UART 34 is used for communication with the guitar amplifier 10 (main unit). A UI 35 is connected to the CPU 31.

[0057] UI 35 Figure 3B As shown, LEDs (an example of a lamp) 38a to 38d prepared for each patch and foot switches (foot buttons) 39a to 39d prepared for each patch are included.

[0058] Figure 4This is an explanatory diagram of the patch. Patch 1 among patches 1 to 4 is used as an example for explanation. The DSP 15 operates as a device that performs multiple musical sound processing by executing a program, in other words, as a device including multiple musical sound processing circuits. That is, the DSP 15 operates as multiple musical sound processing circuits by performing signal processing using an algorithm corresponding to the target musical sound processing. In addition, the musical sound processing circuit may also include an integrated circuit other than the DSP 15 (Field Programmable Gate Array (FPGA), application-specific integrated circuit (ASIC)), or a digital and analog circuit. In Figure 4 1, as an example of one or more musical sound processing circuits selected from a plurality of musical sound processing circuits operable by the DSP 15 and applied in solo mode, the diagram shows a preamplifier 52, a gain on / off circuit 53 for solo mode, a send / return control circuit 54, a special effect circuit 55, and a power amplifier 56 (hereinafter sometimes collectively referred to as "musical sound processing circuits 52 to 56"). The DSP 15 can operate as a device including the musical sound processing circuits 52 to 56. The output of the power amplifier 56 is connected to the DAC 18, and is further connected to the power amplifier 19 and the speaker 20.

[0059] The preamplifier 52 includes a path for using excitation and a path for not using excitation, and the excitation can be selected to be turned on / off by the path selection switch SW1. In addition, the gain on / off circuit 53 includes a path for increasing the gain in solo mode and a path for not changing the gain, and the gain increase can be selected to be turned on / off by the path selection switch SW2. In addition, the sending / returning control circuit 54 includes a switch SW3 for selecting the on / off of the signal from the return terminal 23, and can select whether to use an external device. In addition, the special effect circuit 55 includes a circuit for giving effects ( Figure 4 In the example of FIG, a path for applying an effect (delay) and a path for not applying an effect can be selected by switching SW4 to turn on / off the effect. The power amplifier 56 includes two equalizers and a switch SW5 for selecting one of the equalizers.

[0060] The patch includes information indicating one or more musical sound processing circuits used in solo mode (in patch 1, the preamplifier 52, the gain on / off circuit 53, the send / return control circuit 54, the special effects circuit (effector) 55, and the power amplifier 56), as well as information indicating whether musical sound processing is required using the musical sound processing circuits 52-56, that is, information indicating the on / off settings of switches SW1-SW5 included in the musical sound processing circuits 52-55 (referred to as solo control instruction 51). When solo mode is set to on, on / off control (on / off setting) of switches SW1-SW5 is performed based on the on / off settings for the musical sound processing circuits 52-56 indicated by the solo control instruction 51. This causes the DSP 15 to operate in accordance with the circuits in patch 1. The type and number of sound processing circuits, as well as the settings shown in solo control indication 51 (on or off settings for each sound processing circuit), can be set differently between patches. This allows guitar amplifier 10 to have multiple sound processing circuit settings for solo mode. By changing patches, the sound processing circuit configuration used in solo mode can be easily changed. Solo control indication 51 is an example of "settings for one or more sound processing circuits used in a specific performance mode."

[0061] Furthermore, the excitation of the preamplifier 52 is as follows Figure 5 As shown, multiple motion characteristics can be provided. One motion characteristic can be assigned to one patch, and different motion characteristics can be assigned to different patches. Thus, multiple patches with different motion characteristics can be registered in RAM 13.

[0062] Figure 6 The graph shows the rise and fall of the level caused by turning on / off the gain of the on / off circuit 53. As described above, in the solo mode, the gain can be increased. Figure 6 The figure shows the effect of the delay effect. The figure shows the output of the reverberant sound in conjunction with the input of the original sound (direct sound).

[0063] Figure 7 Indicates the mute processing when switching patches. Figure 7 As shown, when a patch change begins at T1, the mute level is set to 0 until T2. During the DSP program change and parameter setting, the mute level remains at 0, i.e., the sound is muted. Then, when the DSP program change and parameter setting are completed, the mute level returns to 1 from T3 to T4. As described above, by muting the abnormal sound generated by the DSP program change and parameter setting associated with the patch change, the abnormal sound is prevented from being emitted externally.

[0064] like Figure 8 As shown, when switching between on and off the switches SW1 through SW5, a fade-in / fade process switches the on and off paths, eliminating the need for stuttering. As described above, the on / off switching of switches SW1 through SW5 is linked to the on / off switching of the solo mode. This allows for switching to the solo mode timbre without stuttering.

[0065] Figure 9A 、 Figure 9B and Figure 9C 30 is an explanatory diagram of the operation of the foot controller 30. Figure 9A In the example, LED 38c corresponding to patch 3 (channel (CH) 3) lights up. In this state, if the user wishes to change to patch 2, they press foot switch 39b corresponding to patch 2. Information indicating the change to patch 2 is transmitted to guitar amplifier 10. CPU 11 of guitar amplifier 10 accepts this information as an instruction to change the selection to patch 2, which is different from patch 3, and changes the selected patch from patch 3 to patch 2.

[0066] When the change from patch 3 to patch 2 is completed, the information of the content is sent to the foot controller 30. Then, for example, under the control of the CPU 31, Figure 9B As shown, LED 38c goes out and LED 38b corresponding to patch 2 lights up. In the above state, it is assumed that the foot switch 39b corresponding to patch 2 has been pressed. Then, information indicating that the foot switch 39b has been pressed is sent to the guitar amplifier 10. The CPU 11 of the guitar amplifier 10 receives the above information as a solo mode on signal (a request to turn on the solo mode: information indicating that the solo mode is turned on), and performs on / off setting of switches SW1 to SW5 based on the solo control instruction 51 of patch 2, so that the DSP 15 performs musical sound control in the circuit structure according to patch 2. As shown in FIG. Figure 9C As shown in FIG, when the solo mode is on, the LED 38b flashes under the control of the CPU 31, indicating that the solo mode of the patch 2 is applied. In addition, the LED 38b may not flash, but light up in a color or color temperature different from that when the patch 2 is selected. In addition, when the solo mode is turned on, the LED 38b flashes under the control of the CPU 31, indicating that the solo mode of the patch 2 is applied. Figure 9CFrom the state shown, when the foot switch 39b is pressed, information indicating that the foot switch 39b has been pressed is sent to the guitar amplifier 10. The CPU 11 of the guitar amplifier 10 receives this information as a solo mode off signal (a request to turn off the solo mode: information indicating that the solo mode is off), and sets the switches SW1 to SW5 to be off regardless of the solo control instruction 51 of patch 2. Then, the information indicating off is sent to the foot controller 30, and under the control of the CPU 31, the LED 38b is turned on to indicate off ( Figure 9B status shown).

[0067] Figure 10 and Figure 11 1 is a flowchart showing an example of processing by the CPU 11 of the guitar amplifier 10. Figure 10 In step S1, the CPU 11 obtains reception information from the foot controller 30. In step S2, the CPU 11 generates a reception processing request interrupt. In step S3, the CPU 11 transmits LED status (state) to the foot controller 30. The LED status is information indicating the on / off state of LEDs 38a to 38d.

[0068] Figure 11 Indicates the process of receiving a processing request interrupt. In step S01, the CPU 11 obtains the SW status included in the reception information obtained in step S1. The SW status indicates the state of the foot switches 39a to 39d, that is, on / off.

[0069] In step S02, the CPU 11 compares the current SW status with the previous SW status and extracts the difference. In step S03, it determines whether the switch is on for any of patches 1 to 4 (CH1 to CH4) (whether any of foot switches 39a to 39d is on). If a negative determination is made in S03, the interrupt processing ends or other processing is performed.

[0070] If a YES answer is given in step S03, the CPU 11 determines whether the CH number of the switch in the on state is the same as the CH number of the currently selected patch (step S04). If it is the same as the currently selected CH number, the process proceeds to step S05. If it is different from the currently selected CH number, the process proceeds to step S10.

[0071] In step S05 , the CPU 11 determines whether the solo mode is currently off. If it is determined that the solo mode is off, the CPU 11 proceeds to step S06 . If it is determined that the solo mode is not off, the CPU 11 proceeds to step S08 .

[0072] In step S06, the CPU 11 performs processing to turn on the solo mode. At this time, the CPU 11 constructs a circuit for the solo mode in the DSP 15 based on the on / off settings of switches SW1 to SW5 indicated by the solo control instruction 51 of the patch with the currently selected CH number.

[0073] In step S07, the CPU 11 determines to flash the LED corresponding to the currently selected CH number and reflects it to the LED status for transmission (step S12). As a result, in the foot controller 30, the LED corresponding to the patch applied in the solo mode flashes.

[0074] In step S08 , the CPU 11 performs a solo mode off process. This off process turns off switches SW1 to SW5 of the musical sound processing circuits 52 to 56 regardless of the setting value of the solo control instruction 51 (an example of a “predetermined setting”).

[0075] In step S09, the CPU 11 determines to light the LED corresponding to the currently selected CH number in a normal state and reflects it to the LED status for transmission (step S12). As a result, in the foot controller 30, the LED corresponding to the patch applied in the solo mode is lit.

[0076] In step S10, the CPU 11 performs patch (CH) switching processing in the solo mode ON state, that is, changes the patch applied in the solo mode and changes the DSP program or parameters.

[0077] In step S11, the CPU 11 determines to flash the LED corresponding to the changed patch and reflects this to the LED status for transmission. As a result, the LED corresponding to the changed patch applied in the solo mode flashes on the foot controller 30.

[0078] Figure 12 and Figure 13 The following shows an example of processing in the foot controller 30. In step S21, the CPU 11 obtains the current SW status (on / off of the foot switches 39a to 39d) and stores the SW status in the RAM 33.

[0079] In step S22, the CPU 31 compares the SW status obtained in step S21 with the previously stored SW status to determine whether there is a difference. If a difference is determined, the process proceeds to step S24; if not, the process proceeds to step S23. In step S23, the CPU 31 determines whether a predetermined time has elapsed since the last transmission. If the predetermined time has elapsed, the CPU 31 proceeds to step S24; if not, the process ends.

[0080] In step S24, the CPU 31 transmits the current SW status to the guitar amplifier 10, and records the transmission time in the RAM 33. In step S25, the CPU 31 enables reception interruption.

[0081] Figure 13 This example illustrates processing for a receive interrupt in the enabled state. In step S31, CPU 31 obtains the LED lighting request status from guitar amplifier 10. In step S32, CPU 31 disables the receive interrupt. In step S33, CPU 31 performs LED lighting processing corresponding to the LED lighting request status. This process turns LEDs 38a through 39d on, off, or blinks according to the LED lighting request status.

[0082] According to the embodiment, the switching on / off of switches SW1 to SW5 defined by the patch is linked to the switching on or off of the solo mode, so that the circuit structure used in the solo mode can be easily constructed. When the solo mode is switched on / off, the algorithm for implementing the musical sound processing circuit of the DSP is not changed, so that the sound interruption can be avoided. In addition, since multiple patches are stored, it is easy to switch patches and change the control content of the musical sound for the guitar amplifier 10. In addition, the switching on of the solo mode and the selection of patches can be performed using a foot switch, so the guitarist can easily operate the patch selection of the solo mode and the switching on / off of the solo mode even when playing. The structures shown in the embodiment can be appropriately combined within the scope of the purpose.

Claims

1. A guitar amplifier that processes input musical sound and outputs the processed sound, has a plurality of information sets, and has an on / off function for special playing modes corresponding to the plurality of information sets, wherein the on / off function has different setting values ​​than the off function for the special playing modes, the guitar amplifier comprising: a storage device storing a plurality of the information sets, each of the information sets including setting values ​​for one or more musical tone processing used in the special performance mode; as well as The control device, when information indicating that the special performance mode to which the information set selected from the plurality of information sets is applied is input, changes the settings of the one or more musical sound processing to settings according to the setting values ​​of the selected information set, The control device changes the settings of the one or more musical sound processing to predetermined settings regardless of the setting values ​​in the selected information set when information indicating the disconnection of the special performance mode is input, and changes the setting of at least one of the musical sound processing and selects one of the two operations, The control device performs a fade-in / fade-out process when switching a signal path of musical sound processing between an on path and an off path in accordance with the switching of the information set applied in the special performance mode.

2. The guitar amplifier of claim 1, wherein The setting values ​​included in the information set indicate whether the one or more musical sound processing are necessary or not.

3. The guitar amplifier according to claim 2, wherein The need for one or more musical sound processing is selected from one or more of the need to use excitation, the need to change gain accompanying the on / off of a special playing mode, the need to use external equipment, the need to impart effects through an effector, the need to use an equalizer, and the need to change the volume.

4. The guitar amplifier of claim 1 , wherein When any one of the multiple information sets has been selected, the control device accepts input of information indicating the selection of an information set that is the same as the selected information set as information indicating the on or off of the special performance mode to which the selected information set is applied, and accepts input of information indicating the selection of an information set that is different from the selected information set as an indication of a change to the selection of a different information set.

5. The guitar amplifier of claim 4, wherein When the control device receives input of information indicating the selection of an information set different from the selected information set as an indication of a change to the selection of a different information set, while any one of the multiple information sets has been selected, the control device changes the settings of one or more musical sound processing used in the special performance mode based on the setting values ​​contained in the different information sets.

6. The guitar amplifier of claim 5, wherein The control device performs a muting process when changing the settings of the one or more musical sound processes.

7. The guitar amplifier according to claim 5 or 6, wherein The one or more musical sound processing is arbitrarily selected from one or more of excitation, gain, use of external equipment, effect application using an effector, equalizer and volume change.

8. The guitar amplifier of claim 1 , comprising a foot controller, The foot controller is used to input information indicating selection of the information set, information indicating turning on the special performance mode, and information indicating turning off the special performance mode.

9. The guitar amplifier of claim 8, wherein The foot controller includes a plurality of buttons corresponding to the plurality of information sets respectively. When any one of the multiple information sets has been selected, the button corresponding to the selected information set functions as a button for inputting information indicating the on or off of the special performance mode to which the selected information set is applied, and buttons other than the button corresponding to the selected information set function as buttons for switching the corresponding information set to the selected information set when pressed.

10. A method for controlling a guitar amplifier, wherein the guitar amplifier processes input musical sound and outputs the processed sound, the guitar amplifier having a plurality of information sets and having an on / off function for specific playing modes corresponding to the plurality of information sets, wherein the on / off function has different setting values ​​than the off function for the specific playing modes, the method comprising: storing a plurality of information sets, each of which includes setting values ​​for one or more musical tone processing used in the special performance mode; as well as When information indicating that the special performance mode to which the information set selected from the plurality of information sets is applied is input, the settings of the one or more musical sound processing are changed to settings according to the setting values ​​of the selected information set, When information indicating the disconnection of the special performance mode is input, the settings of the one or more musical sound processing are changed to predetermined settings regardless of the setting values ​​in the selected information set, and one of the two operations is selected by changing the setting of at least one musical sound processing. When the signal path of the musical sound processing is switched between the on path and the off path in accordance with the switching of the information set applied in the special performance mode, the fade-in and fade-out processing is performed.

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