The best mono module I could find.
I can see why it's more expensive than polyphonic pro-800 - all the patch sockets, buttons and leds cost money. The lights look fantastic in darker room.
The unique feature is double signal chain of separate VCFs, VCAs and LFOs. But some secondary utilities are limited: there is no separate output for noise, no sample&hold, no separate volume control for the oscillators, no effects.
Each oscillator has a "sub-oscillator" which is a configurable oscillator exactly one octave lower, and it can not be turned off completely using device's controls. The knobs can only make them quieter. That was confusing when I watched wave shapes. The external software is necessary to turn them off.
The manufacturer packed too many features into a small box which make it a bit unintuitive. Reading manual is absolutely necessary: the routing and modulation logic is not obvious from front panel, and there are essential hidden key combinations. Thankfully, there is some good guidance on youtube.
For comparison, the 2600 is on another spectrum of design approach: large, easy an self-explanatory interface, more utilities, but has fewer main components.
The hardware quality is perfect, the knobs are solid. The sound is as expected. No regrets, I wish I had more time to explore and experiment.
