One of the most underrated, unreleased boards from Ciat. I believe this was going to be a Mebenthey module but he never released it for some reason.
Not sure of any particular mods but If you put all those 6 modulation boards (rando, preamp, swoops + anti versions), on 1 pcb that would be a winner. Works well with 104 and 105 and audiorate stuff when I’ve used it. Also great with Rolls. I have always used a TS914 which you need to get from eBay - lots of NOS.
Here’s some info I found and and not quite sure who wrote it originally. I think it was from the Facebook group.
Here’s the quote :
"The original used a TS914 rail-to-rail CMOS opamp, but I substituted a LM324 in my build which seems to work fine. Given the very high frequencies at play and low power situation, you may get noticeably different characteristics by trying different opamps.
The oscillator topology is similar to another of Delton Horn’s “unusual oscillators”, different from the ones in the Rollz-5. As noted on the paper circuits page, one oscillator has a fixed pitch and the other is variable (“P” knob) over a small range. The two oscillators are connected to a comparator and then processed by a transistor ladder filter whose frequency is controlled by the “F” knob and modulation input. Pretty simple stuff.
The “*” capacitor is a DC blocking cap. If you plug audio rate stuff into the filter’s modulation input, it might also affect the variable oscillator’s behavior. More experimenting to do here.
The “V” knob and associated modulation input are interesting. They provide DC offsets for the non-inverting input of the comparator and seem to give a Pulse Amplitude Modulation input (distinct from PWM). Yeah, they control volume, but also interact with the heterodyning of the two oscillators. I’m sure that connecting Swoops and Preamps here will help unpack its behaviors."
