I know this is an older post but i think it's timeless. I just want to send a big thanks to @Verne-Bunsen for their initial experimentation and sharing of this idea. One simple thing that has vexxed me since I original got my Helix Floor a few years ago was a way to simply switch a single effect, or in this case a 3db boost, easily live (non-midi). I have my unit set to Snap/Stomp, bottom row always snaps, clean through lead, pretty standard. And the upper stomp row with four effects, generally a distortion or modulation, delay 1, delay 2 and a 3db boost. But that upper row is always a tricky dance for my (now) old, fat-a** and big feet, and that boost is always on and off for me throughout the night. A precise target that one.
Backstory is that I got used to a large external button for the same thing when I used a GT-3 for many years and just loved that but the Helix just doesn't offer the basic option of plugging something like a Boss FS-5L in to say EXP 3 and having it just work. It does not BTW, I tried. And that's a disappointment. Minor I know, but still. So I decided a couple weeks ago to see if there was anything I was missing. I posted to the FB group and one helpful member said the DOD mini expression pedal would work, as it had a TS switch option and that was 10k ohms. And I can confirm that it does indeed work. Simple assign that volume block to FS3, latching, with a TS cable and up is off, down is on. So I had that option. But that is a $100+ pedal and a bit of overkill to be honest. But I'd go that route if I had to.
Then I found this post. Lightbulb! Ordered up some 10k ohm resistors and a couple 3PDT 9 pole switches as indicated above. Delivered this evening, wired with some temp jumpers, plugged it in, pressed the switch and Viola! it works. Exactly what I need and cheap, cheap, cheap. Now to pick an enclosure and make it into something stage-worthy. I'll probably make two, or possible a double switch box because it also works in EXP2 so a little experimentation with assignments and I could have two additional stomp buttons for critical functions. But having an external switch I can place anywhere and make work easily solves my problem and makes me happy
I'll post some pics back once I get everything mounted and hardwired. But thank you.