My Boss DS1 JHS Synth Momentary switch is super useful. Playe for an hour straight, can manually tap in tremolo beats or use the synth to accent parts and quickly go back to default DS1 sounds. Just connected the lugs to S1, didn’t need an additional dpdt switch. Momentary is normally off so S1 can function as normal, and to activate momentary switch, just turn S1 to off position. I tried so many different tone and gain mods. Seems like the original filters work best. I only kept one that a may change the mid High Pass a hair, definitely noticeable only when a/bing pedal. Mid hump isn’t as drastic but I change back.

Not finished yet though, going to add the Casper Electronics DS-1 Gate/Feedback/Oscillation Mod. Ordered some transistors, hopefully it’ll sound badass, may add a pot somewhere, Kind of packed already in there, but Iv’e seen crazier. I’ll post all the circuit bends once last mod installed. I have another DS-1 probably keep this butchered one up and sell a cleaner one.
https://mrfuriousrecords.com/audio/the-mr-furious-audio-interpretation-of-the-casper-electronics-ds-1-gate-feedback-oscillation-mod/