[sdiy] Polymoog resonator question

sleepy_dog at gmx.de sleepy_dog at gmx.de
Sun Oct 14 09:16:41 CEST 2018

Tim Parkhurst:
> Just a thought: skip the voltage control, put in digipots for the 
> panel controls, and make the whole thing programmable. Especially for 
> use as a resonator, it would be cool to dial in several acoustic 
> instrument responses and then be able to bring them up quickly. Okay, 
> maybe keep voltage control of the center frequency for nifty sweep 
> sounds.

Ha. That's pretty much the PCB I started a year ago, but then got 
interrupted and put it on hold.
I, too, had seen/heard that one video, and thought putting in a 
cheap-ish MCU and make it recall settings and maybe change settings via 
MIDI, to get those different instrument sounds qickly, would be really 
neat. Just that I wasn't hell-bent on replicating the Moog thing's 
special reponse exactly, used 3x OTA based SVF instead, and cheap PWM 
control with simple filters -> very slow control speed (with regards to 
"fancy sweeps", which won't be too fancy then I guess).
Maybe some ugly winter day, I'll pick that project up again...
Or the OP is faster, let's see :D

> And while we're talking about resonators and the ARP 2700 (over on 
> AH), has anybody ever found schematics for, and successfully 
> duplicated the fixed filter / resonator section of the ARP Soloist and 
> Pro Soloist? Seems like that has a history of pretty useful acoustic 
> instrument responses. Also, has anyone ever run a poly synth through a 
> Soloist resonator section? Also also, how does the Soloist switch 
> presets? Are there a bunch of relays or transistor circuits in there 
> switching different resistor and cap values around?
> Tim (on a questionable question quest) Servo
> On Fri, Oct 12, 2018 at 1:52 AM Tom Wiltshire <tom at electricdruid.net 
> <mailto:tom at electricdruid.net>> wrote:
>     > On 11 Oct 2018, at 18:31, Rutger Vlek <rutgervlek at gmail.com
>     <mailto:rutgervlek at gmail.com>> wrote:
>     >
>     > That video is also my sole reason for wanting a resonator. I'd
>     actually hope for the resonator to also be able to track keyboard
>     moderately well to (optionally) maintain a fixed interval between
>     notes played and resonant frequencies.
>     That’s possibly useful, but missing the point of a resonator, I’d
>     say. The idea is that we’re modelling the resonances of a
>     instrument body in some way, and those are fixed for a given
>     instrument. That’s a key part of what gives one instrument a
>     different character from another.
>     > My suspicion is that Elhardt identified a very small number of
>     sweet spots that are very well tuned to the input signal as well
>     as to the reverb on top. I believe it's only partly thanks to the
>     resonator, but also thanks to his craftsmanship (or many hours of
>     exploration) that he can make it sound this good.
>     Certainly his playing is a big part of the success of that video.
>     He takes a “trumpet-like” sound, but then does a very good job of
>     playing it like a trumpet. If you’d done the “Jump” chords (for
>     example) instead, it wouldn’t have sounded half as good.
>     Tom
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