[sdiy] MIDI VCO Control - but not CV?

[cheater cheater]

Tom,
I guess what I'm asking about is: how easy is it to modify my
favourite VCOs (e.g. the MOTM VCOs or the moog ones) to work with
this? What would I need to look for?
Not all VCOs use an accumulator design - do they?
I am thinking it could be very difficult to do with a sine oscillator.

Cheers
Damian

On 7/14/08, Tom Wiltshire <tom at electricdruid.net> wrote:
>
>  What you're talking about sounds like a MIDI-controlled DCO, so all the
> recent comments about DCOs apply here too.
>  Sampa's quite right to bring up the amplitude compensation problem. This is
> the main snag with the typical DCO design, but the problem is by no means
> insoluble.
>
>  You're also right to point out that you'd still need a CV to control the
> filter. But you're going to need a CV to control the amplitude too, so
> you're going to have a DAC of some type in there.
>
>  It's do-able, but it isn't going to be much simpler or easier. In some
> ways, MIDI2CV with a high accuracy DAC is more straightforward. But by all
> means go ahead and prove me wrong!
>
>  Just my 2 pence,
>  T.
>
>
>  On 14 Jul 2008, at 19:13, cheater cheater wrote:
>
>
> >
> > Samppa,
> >
> > I'm only talking about taking existing VCO designs, and modifying them
> > to work in such a setup.
> >
> > Cheers
> >
> > On 7/14/08, Samppa Tolvanen <samppa.tolvanen at gmail.com> wrote:
> >
> > > On 7/14/08, cheater cheater <cheater00 at gmail.com> wrote:
> > >
> > > >  Wouldn't it be *much* easier to make a midi2trigger module, that
> would
> > > >  then hardsync the VCOs?
> > > >
> > > >
> > >
> > >
> > > If I got You right, it would be MCU based squareware oscillator, eh?
> > >
> > >
> > >
> > > >
> > > >  Are there any popular/interesting VCO designs that wouldn't work well
> > > >  with being synced this way?
> > > >
> > >
> > >
> > > Sawtooth oscs would be  just fine as long as You don't mind amplitude
> > >  multiplying/dividing by powers of 2 per octave :D
> > >
> > >
> > >  Samppa
> > >
> > >
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