This one has been in the works for a long time. I love the 1776 Effects Multiplex. Just a stellar echo sound with a cool momentary warp/detune feature. The Jr. model has modulation, which really adds a lot, but it doesn't have the momentary button. I wanted both. So step one was a Multiplex with the supplemental modulation PCB, but then I had another idea… momentary oscillation.
There are a few ways to do this, but after
asking around, I decided to go with my original idea, which was to use a momentary 3PDT switch where the common row was wired to the feedback control on the PCB, the normally connected row was wired to the feedback pot, and the momentary row connected to a trimpot of the same value, set just at the edge of oscillation. With a little help from Morgan (see the linked thread), I got it all working as expected.
So now I have a Multiplex with modulation, detune, and oscillation. Throw in a decal design from my talented designer from Dave, and we're good to go…
…except that I seem entirely incapable of building a Multiplex without mis-drilling a hole. My original location for the output jack was not compatible with my placement of the PCB. So I have a little bit of a silly I/O situation going on, but oh well.