I'm a bit in limbo these days, because I'm creeping along at updating my set up and don't have the full instrumental force that I like. As it stands, I'm using a Poly Evolver Keyboard in place of a Prophet '08 as a part-time monophonic instrument. It has taught me one surprising thing. The PEK makes a superb polyphonic synthesizer, but for monophonic uses, I actually prefer the Prophet '08. I would rather use a bi-tmbral analog instrument than an analog-digital hybrid. As a matter purely of personal preference, the tones of the Evolver's digital oscillators strike me as lacking in dignity, as being even slightly comical - which is the last quality I want in my music. And this has to do, not only with the Evolver's particular tones, but with digital tones in general (except those that emulate analog tones).
Again, the digital oscillators make for superb and more complex polyphonic effects. I like them for creating dreamy suspenseful atmospheres. But when it comes to melodic passages, the pure sawtooth and pulse width analog tones, with their simple gravity, alone satisfy. This realization comes as a happy surprise.