In trying to answer my own question regarding voice-spreading portamento on other synths, check out this link discussing the Oberheim OB-X analog polysynth:
http://www.retrosynth.com/~analoguediehard/studio/keyboards/oberheim_obx/index.htmlIf you skip down quite a bit (~2/3rds of the way), he talks about using the synth in Unison mode, which reveals the OB-X's imperfections in its polyphonic glide, which causes different glide rates for each voice. Hey! This is just like what I had discovered about the Mono/Poly! He is clearly in love with this sound, just like me.
Based on his text, though, it does not appear that the circuit for the OB-X was ∗purposely∗ designed to spread the voices -- it doesn't sound like Oberheim was purposely trying to have the glide rates be different, they just turned out that way. So, the purposely-detuned portamento in the Mono/Poly (and my modded Polysix) could still be a unique feature to itself.
What other synths have multi-voice glide? Are the individual glide rates purposely different from each other?
Chip
--- In PolySix@yahoogroups.com, "chipaudette" <chipaudette@...> wrote:
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> After tuning the aftertouch, now I'm tuning the portamento. While the portamento is a really nice addition to the Polysix, my implementation didn't sound as exciting as the portamento on my Mono/Poly. So, I dug into the Mono/Poly to see how it works...
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> http://synthhacker.blogspot.com/2013/04/portamento-voice-spreading-from-monopoly.html
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> I didn't realize that the Mono/Poly purposely spreads the pitch of the voices during a portamento slide. Cool! When I implemented the pitch spreading in the portamento on my Polysix, it suddenly came to life. Wow! Totally cool. Audio samples are in the video in the link above, if you're interested.
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> Do other synths besides the Mono/Poly spread the pitches during portamento? Or did the designers of the Mono/Poly hit upon something unique?
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> Chip
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> --- In PolySix@yahoogroups.com, "chipaudette" <chipaudette@> wrote:
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> > Hi All,
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> > My efforts to add aftertouch to my Polysix have finally reached the point where she plays! And, as a bonus for adding the pitch control circuitry to implement by aftertouch-driven vibrato, my Polysix now has portamento. Sweet.
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> > If you're interested, I've got a demo video:
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> > http://synthhacker.blogspot.com/2013/03/polysix-aftertouch-and-portamento-demo.html
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> > Chip
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