I have a guitar amplifier with a 'clean' and 'lead' 'channel' that can be manually toggled. I'd like to switch between my different amplifier settings using a 'foot controller'.
I often see schematics from people who make their own foot controller using a 1/4 inch TS (or TRS) jack with switches between the tip/sleeve and ring/sleeve. These schematics do not have current limiting resistors in series with the switches(!).
My amplifier (Roland Cube 40GX) has no mention of supporting these kinds of 'DIY' foot controllers in its manual nor can I find a schematic. But from what I can gather, the officially supported FS-5U and the FS-6 are just a switch inside a fancy branded enclosure.