[sdiy] analog synths with digital controls? how does that work?

[Doug Terrebonne]

Anyone interested in how the computer controlled analog polysynth works should 
read the Prophet-5 technical manual - 


http://www.synthfool.com/docs/SequentialCircuits/Prophet_Series/Sequential%20Circuits%20Prophet%205%20Technical%20Manual.pdf


Doug 
synthparts.com



----- Original Message ----
> From: Hugh Blemings <hugh at blemings.org>
> To: neil harper <metadata at gmx.com>
> Cc: Synth-Diy <synth-diy at dropmix.xs4all.nl>
> Sent: Tue, January 22, 2013 7:58:52 PM
> Subject: Re: [sdiy] analog synths with digital controls? how does that work?
> 
> Hiya Neil, All
> 
> In delurking I'll preface the following by observing that  I'm firmly in the 
>camp of "knowing enough to be dangerous"... :)
> 
> >  [...]
> >
> > there's gotta be a digital layer between the knobs and the  analog parts
> > of the circuit right? so does that mean that it's sampling  the position
> > of every knob (which i guess it can multiplex) and then  using DAC's to
> > output the required control voltages for all of the knobs  (a dac channel
> > for each knob)?
> 
> Yes, as I understand it, that's  the way a lot of the analog path is controlled 
>- by DAC's for each parameter  that needs to be controlled.
> 
> > what about things that aren't typically  voltage controllable, like the
> > resonance control of a filter..
> 
> I  gather the common approach here is to use a digital potentiometer, but I 
>daresay  others on the list could answer with more authority on this one :)
> 
> This  is I think the approach that's been used in various forms for pretty much 
>every  digitally controlled analogue synth from the 80's on.
> 
> Happy  Hacking,
> Hugh
> 
> 
> 
> 
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