I spent a lot of time messing around with the waveform generator/modulator back in the day. It was fascinating to keep tweaking things to see what your changes did. I guess before Sonix I'd never know about or messed with something this synth like. I have to admit I didn't really get it at the time.
As cool as it was, in the end I never found any use for Sonix as a tool for the music I wanted to create (rock/blues/metal), so it was back to Deluxe Music. If I was into electronica/synth type music Sonix would have been pretty handy.