Amos question (Envelope)

The Moog Forum Taurus, Minitaur & Sirin
1

Recent thread on Minitaur envelopes; I had a followup question which is a bit more detailed and digs into the architecture/electronics of modern synths.

Platforms like the Phatty (SilLabs) and Taurus III (Ti, I think?) have a user facing ‘precision mode’ and a known digital range when it comes to storing presets at a given value.

Any analog synth that has presets must ‘digitize’ the pot resistance with ADC at a high enough resolution in order to recall the preset with some level of precision.

My question is… given that these Moog platforms are using standard analog “Alpha” brand pots and given that they have presets (so must digitize either upon storage, or in realtime as knobs are tweaked), WHERE EXACTLY are envelopes being driven when you play, after recalling a preset?

Are they purely digital, meaning that the stored values drive an algorithm which drives a single voltage over time with a single output on Filter Cutoff for instance; OR is the resulting voltage that would normally come from a pot into opamp mimic’d on a number of output ports (one per envelope stage) but otherwise, the rest of the envelopes are purely analog (caps and resistance that charge, discharge, etc.).

Hopefully you can make sense of this gibberish!

And as always, thank you.

2

MC has stated before (only recently in fact) that the Taurus 3 envelopes are digital.

3

the envelopes in the Minitaur (and Taurus III, and Sub Phatty) produce a single output voltage that affects filter cutoff CV or VCA level CV.

The Voyager and Little Phatty use a system more like the second one you’re describing, where there is an analog EG circuit with multiple digitally-generated voltages to set the attack time, decay time, etc.

4

Exactly what I was looking for, thank you. And obviously, my Old School is just missing the digitally generated circuitry to set ADSR.

I’m sorted!