I feel fortunate to have gotten one of these while they were still available. There were several filter options and I opted for the SMR4 MKII build. It comes with 2 envelopes, 2 LFOs and 12 modulation matrix possibilities which offer an incredible amount of depth to this module. This is useful when you start getting into the oscillator waveforms, which are not limited to VA kind of sounds. It is most definitely a hybrid analog/digital synth and it sounds it. It most closely resembles the DSI monoevolver in sound and in many cases has a much wider sweet spot.