I can't remember which synth it was. But many years ago I had some synth that would random arpegiate, the parameter knob for it would vary the range it covered. On the up up, down down or up down it would increase how far it would go. On random it would start of varying randomly by single semitones up down randmly. As it was incremented it would go up and down a whole tone, a tone and a half etc. Pretty much equidistant from the note(s) held, but randomly instead of up up or down down. It sounded like the best solo ever just by holding down an augmented chord and cranking the knob. Maybe it was a poly 61? I totally cant recall.
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