Hi.I had the same questions a couple of years ago . I ended up buying the Analogue Systems
RS370 Polyphonic harmonic generator. I mainly use A100 modules but this is a great module
that sounds amazing running through doepfer filters. You can get beautifully rich and mello
pads if you detune the 6 different voices and nasty edgy pads if you run it trough a Wasp
filter. There is an expander to change the harmonics in real time but this only works if you
are in Mono mode.

Stuart