The Cyndustries List

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
>