Hi People
I have the project of building a Lowrider, and i would like to add a little mod on it : putting the upper octave on one footswitch, and both the lower octaves on another one.
I already have a few ideas on how i could make it, but my main concern is wich one of these ideas would be the least likely to generate big POPs while switching. I also have to consider that i'm working with an already made PCB, so i have to find a way to put any additional wire on it. Here are my ideas:
Alternative A (http://i1277.photobucket.com/albums/y490/Willyboy2101/Lowrider1_zps70dd43bf.png): The simplest way would be to put a direct switch on the wires going to the mixing op-amp. However, i would have to use an X-acto to cut some of the traces and risk to damage the PCB, and there is also nowhere i could add wires, so this alternative is pretty much out.
Alternative B (http://i1277.photobucket.com/albums/y490/Willyboy2101/Lowrider2_zpsac36ce27.png): I put my switches at the output of each of the potentiometer. All i would have to do is to add a wire on pin 2 of each pots, solder R46, R49, R55 on the footswitches, and put wires in the holes where those R were supposed to be on the PCB. Seems pretty much doable.
Alternative C (http://i1277.photobucket.com/albums/y490/Willyboy2101/Lowrider3_zps7a9b44b4.png): Probably the simplest one to do. I would use the switch to put the signal comming from the potentiometer to ground (or to VR in this case). All i would have to do is to solder wires on the pins 1 and 2 of each pots without messing with any component on the PCB.
Since my main concern is that i don't want any POP while switching, which one of B or C would you suggest me (assuming that i completely discard A)?
Alternative C seems all good to me. Go with that:)
...interesting mod. Good luck!
There is also a mod on tagboard for the micro-pog dual control setup.