I was planning on doing a more thorough write-up here of this thing at some point, but here’s mine (in its current state, at least):
This is based around the Doepfer polyphonic modules: A-111-4 Quad VCO; A-105-4 VCF; 2x A-141-4 Envelope Generators (one for the VCA, one for the VCF); and the A-132-8 Octal VCA. There are also obviously some other things in there (the ALM/Busy Circuits MFX being the latest addition). I got the NiftyKeyz originally with the intention of doing a modular monosynth since my biggest gripe about my Euro system was that I couldn’t @#$%ing play it, but that evolved into wanting to experiment with the Doepfer stuff. I already had the quad VCO, so I sold some stuff and got the envelopes and filter. Depending on the voice settings, it can still be a monosynth, and a massive one at that.
While I haven’t been able to use it for a lot yet, here are some initial thoughts: the NiftyKeyz mostly works the way it’s described/supposed to in the manual. I say “mostly” only because I was trying to use it with my OT and ended up with spurious MIDI data flying all over the place that I was never quite able to pin down. I was trying something a little dopey at the time and I think it most likely operator error that was the cause rather than any fundamental issue with the NiftyKeyz. Also, the MIDI channel assignment is a bit confusing with the numbering above the keys – I’d have to look at it again with a MIDI monitor to recall exactly what the issue was. I also wish the octave switch went further south – even with the Quad VCO set to its lowest octave it doesn’t get as deep into bass territory as I’d like.
But: the voicing modes work, the auto chord feature works (which is quite cool), the arp works, the LFO works, the keybed is not bad, and for the cost, I think it’s great. At some point I’ll do a video demo – with this batch of modules it sounds pretty massive. Also: the Doepfer poly modules have the option of normalled routing on the backs of the modules via Dupont connectors (think Arduino connectors). With the full Doepfer poly suite (including the MIDI controller module, which I didn’t need because of the NiftyKeys) you can get a full four-voice poly system without any cables in the front – connecting the front jacks to something else breaks the normalled connection, like a patch bay. In this case, while it looks like spaghetti and needs some organization, there are actually 12 fewer cables because the filter, envelopes, and VCA are all connected in the back. Setting that up was a story in itself, but it works!