The Cyndustries List

Thanks for the replies. So if I understand correctly, in DX style
synthesis they have to compensate for amplitude of the modulators as
the keyboard tracks? I'm glad we don't have that problem!

Moe
http://www.stoogeindustries.com

--- In The_Cyndustries_List@yahoogroups.com, "tuninghead"
<thruzero@...> wrote:
>
> 
> Hey Moe,
> 
> Cynthia's reply to you is correct.  Carrier and modulator freqs must
> track.  It took a little looking, but I found the paragraph I posted
> that was the source of your confusion:
> 
> ============
> To sum it all up (no pun), LinCV does not have a constant shifting
> effect.  The amount LinCV will move F is dependent on ExpCV.  Also,
> because the relationship is multiplicative and not additive, we do not
> need to scale our LinCVs with frequency to achieve constant timbre up
> and down the keyboard as classical FM would dictate.
> ============
> 
> What I meant by "scale" was the AMPLITUDE of the modulator as the freq
> is moved. -- and I should have said PM like in the DX-7.  In PM, it is
> effectively the first derivative of the modulator that is used.  This
> results in a rolloff of low freqs (it's like a -6db/oct filter) and as
> you move notes, you have to compensate for this.  The ZO always runs
> everything ratiometrically, so no worries.
> 
> Clear as ever, I hope.
> 
> --Mark Barton
> 
> 
> 
> 
> 
> --- In The_Cyndustries_List@yahoogroups.com, "mate_stubb"
> <mate_stubb@> wrote:
> >
> > I remember a discussion awhile back where it was stated that the
> > modulator doesn't need to be tracking the keyboard in parallel with
> > the ZO being modulated. I thought the reason given was that the lin fm
> > component was added into the total cv separately. Or something like
> that.
> > 
> > Anyway,
> > 
> > My by the ear experiments seem to say otherwise - when I want a
> > constant timbre that tracks the keyboard, I end up modulating both
> > vcos with the kbd voltage.
> > 
> > Did I misunderstand the original post?
> > 
> > Moe
> > http://www.stoogeindustries.com
> >
>