[sdiy] How to use an analog time-domain multiplexer?

cheater cheater cheater00social at gmail.com
Fri Jun 4 15:54:26 CEST 2021


I appreciate your point of view - polyphonic synths should be very
simple - but I respectfully disagree :-)

On Fri, Jun 4, 2021 at 3:51 PM Mike Bryant <mbryant at futurehorizons.com> wrote:
>
> Well from that list
>
> Use a single LFO, noise generator and waveform processor to drive all channels.
> Same for all the trigger and slew stuff.
> Delete the ring modulator.  They do just create noise in polyphonics.
> Not sure that S/Hs have much place in a polysynth either.  I've never simulated one in any digital synth.
> Audio divider not needed.
>
> So really what's left is a pretty standard Moog layout which doesn't really need much patching - you can hardwire much of the Keyboard -> VCOs -> VCAs -> VCFs -> Output mixer permanently and save hundreds of connections.
>
> I think you need to think about what a polysynth is for.   It's really an extremely glorified piano/organ/other keyboard instrument capable of making any sound as individually playable chords.  Thus those sounds have to have a reasonable fundamental frequency content.
>
> Conversely a monosynth has many other uses, right down to that guy on ModWiggler with the Batman avatar saying "it's a modular, you just make fart noises with it"
>
>
> -----Original Message-----
> From: cheater cheater [mailto:cheater00social at gmail.com]
>
>
> It has the following modules:
>
> 2x Standard VCO A-110
> 2x ADSR A-140
> 2 x LFO A-145
> 1x Ring Modulator A-114
> 1 x Audio Divider A-115
> 1 x VC Waveform Processor A-116
> 1 x Noise/Random A-118
> 1 x VCF1 A-120 (24dB low pass 1)
> 1 x XP VCF A-106-6
> 1 x linear VCA A-130
> 1 x exponential VCA A-131
> 1 x linear Mixer A-138a
> 1 x exponential Mixer A-138b
> 1 x Dual S&H A-148
> 1 x Dual VC Switch A-150
> 1 x Trigger Divider A-160
> 1 x Trigger Sequencer A-161
> 1 x Dual Trigger Delay A-162
> 1 x Dual Slew Limiter A-170
> 1 x Multiple I A-180
>
> So: two VCOs, two filters, a ring modulator, a shaper, the usual other processing stages, and some utility modules. That doesn't seem very "wall of noise" to me! It's somewhat less capable than something like a Moog One.
>



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