With the right settings Tetra can be pretty good for warm dubby chords, although I'm not gonna lie the Vermona stuff straight up looks higher quality. I don't know what you mean about software for the Tetra/Mopho... I don't use any of that. Just assigned midi controls to tweak parameters.
Sounds like you've tried both. Tetra's pretty much the only real live polysynth I've used other than the Yamaha SK15 which sounds great but has no MIDI implementation. Out of curiosity I'd love to hear you compare/contrast Tetra vs Perfourmer more than just sound quality.
PS hows the midi implementation on the Perfourmer? The biggest draw of DSI for me is the quality of midi implementation.
I agree you can def make some nice sounds with the tetra, but I just felt it was more aggressive and warm. The way I compared it to the vermona initially was just comparing the raw waves - and the difference is enormous. The vermona's square is nice and round, saw is warm and fuzzy, sine is smooth, etc. The tetra is more buzzy analog sounding. Of course, you still program it to sound tamer - I just feel that some of my soft synths sound smoother straight up (if i didn't have the vermona as well, then I probably wouldn't have sold the tetra). For the sort of music I make, I want smooth sounds and filters, not rough and aggressive....some types of music the tetra would be perfect.
In terms of midi capabilities, the vermona perfourmer is more simple...again why i like it. it only transmits midi notes, and you can assign modulation on the wheels. but it is multi-timbral - which is the whole point of it. so i often have one track using synth 1, another using synth 2, and maybe one using synth 3+4....you can use any combination and it is simple to configure as every control is assigned to knob. the tetra is more fiddly (but can kind of work in a similar way). Obviously, the tetra can be assigned to other midi controllers - but I actually found it a pain to setup my midi controller with it. maybe if i had more patience then it wouldnt be an issue. the actual synths are more simple than the tetra (there are modulation capabilities, and you can get pretty complex with them...but it is no where near as deep as the tetra....personally i'm not into building really complex sounds, so that doesn't bother me). just wish there were more new analog poly synths - even simple ones like the juno. def gap in the market.