Two filters in one, though they can be chained. This is a passive device, no power used (think - same thing as the tone knob on your electric guitar).
Relatively easy build, through there were two nits about the boards fitting together and the knobs, but overall fine.

Sound-wise, it’s OK. Passive, so not a whole lot of activity, but does produce some mellow filtering. Not going to be in my main rack.

Build


Try my cap mod to open up the filter a bit: should be in the build guide. Also: I think these work so much better when varying incoming trig/gate/cv level. Absolutely love these: I've got 4 of them in my main case.

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Thanks for the info, I'll give the cap mod a try if I get a chance.