What kind of footswitch is suitable for switching the AMP1?
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If you use an external footswitch in addition to the internal footswitches to switch the AMP1, it should have the following specifications to ensure that it works properly:
1-way or 2-way footswitch
You can connect a normal 2-way footswitch with a stereo jack to the footswitch connection of the AMP1 in addition to the REMOTE1 and the MIDI1 adapter. The two switches of the external foot switch then take over the respective functions of the left and middle internal footswitches of the AMP1 in direct access mode, i.e. CLEAN/OVERDRIVE and BOOST on/off.
A mono footswitch can also be used. This then switches between the clean and overdrive channels, thus taking over the function of the left internal footswitch of the AMP1 in direct access mode.
Switch (no button!)
The special feature of a switch (latching switch) in contrast to a button (momentary switch) is that it latches (on). With a latching footswitch, depressing the switch causes the circuit to close, enabling a specific function assigned to the switch. If the pressure is released from the foot switch, the circuit remains closed. Only by pressing the switch again is the circuit opened again and the assigned function deactivated.
A push button, on the other hand, requires a sustained press to keep the circuit closed and activate the function assigned to the switch. Releasing the switch opens the circuit and disables the function.
Stereo jack (2-way switch) or mono jack (1-way switch)
So that the footswitch switches the AMP1 properly, a 2-way footswitch should have a stereo jack plug, whereas a 1-way footswitch should have a mono jack plug.
If possible, no LEDs
The switching process with footswitches connected to the footswitch socket of the AMP1 is carried out by measuring the voltage at this socket. Footswitches without LEDs always work. A footswitch with an LED without an internal series resistor also works. In the case of footswitches with LEDs, however, the series resistor can be so large that the voltage drop is not sufficient to trigger the switching process.
More articles on the topic:
AMP1 + External Footswitch - How to get all 4 channels?
AMP1 + external footswitch - Why don't all footswitches work with LEDs?