I’m pretty sure QPQ is discontinued. However, I am told that Bastl 1983 has a 4-channel MIDI quantizer mode that will do pretty much everything the QPQ did, plus a whole lot more
I have been considering designing my own 4-channel MIDI quantizer module, since neither the QPQ or 1983 do what I want, which is to quantize incoming CV to the played MIDI notes (they do this) plus Sample and Hold the played note at the time an external trigger is received (they don’t do this, but I use an uO_c in Quantermain mode that does this… but I’d rather not spend 8hp just for S+H).