I wanted to use an external momentary switch to turn an effect on in a patch outside of stomp box view. I like using patch view for my most basic sounds, clean, rhythm, lead, and piezo.
I already have an expression pedal to control delays and reverb to make things more ambient. I wanted something that I could step on and release.
I found an old switcher I used to toggle banks up and down in an old multi-effects unit, and it did the trick. I used both switches, and wired them to be a direct short normally. This is heel down postion(0%) on an expression pedal.
I wired a 5K ohm resistor(50%) across the contacts on one switch, and a 10K ohm(100%) on the other.
Toggling an effect on only requires a minimal resistance, so either switch can turn an effect on, but the different values of resistance allow me to assign different parameters to each switch.
For example, I assigned a tremolo pedal to be turned on by expression pedal 2, with the minimum speed to the 5K switch, and maximum speed to the 10K switch.
It works great, and I love the fact that I don't have to worry about stomping it a second time to turn it off.
Of course, this setup would work with latching switches, but that would require a second stomp to turn it off.
I've attached a rough diagram, in case anyone finds this useful.
Cheers,
Me