The Sequential Multi-Trak is one of my favorite vintage synths. I really dig the sound of it, and believe it or not, even though it only has one parameter knob, I enjoy editing sounds on it.
I recorded this video simply because I wanted to show what it is like to edit a synth with one parameter knob. Thanks to the matrix layout of the synth, editing is actually very quick.
Probably not what you would want for live performance of parameters but for sound design I haven’t found it to be an issue personally.