I want to do experiment with something like the DX7 use of FM... having 
oscillators modulating oscillators modulating oscillators. (I think that's 
what it does.) My understanding from looking at the DX7 emulators in the 
Csound catalog is that they work with phase rather than amplitude, but I 
don't understand this. Can someone explain this? Is it a simple concept or 
is it complicated?

Mike

I'll quote my own paper on the subject: "When there's a feedback loop, 
frequency modulation and phase modulation are no more equivalent. We 
hear a picth offset during the frequency modulation with feedback 
because there's a DC component (null frequency) in the spectrum of the 
modulated signal. When the modulated signal is added to the frequency, 
this DC component shifts the frequency. In the phase modulation with 
feedback the DC component present in the feedback loop does not change 
the frequency and so the pitch remains stable."

You can get more information here on my website: http://fggp.org/en/crossfm/

Hope this helps.

Regards

Francois

Le 17/10/2012 19:09, Michael Mossey a écrit :
> I want to do experiment with something like the DX7 use of FM... 
> having oscillators modulating oscillators modulating oscillators. (I 
> think that's what it does.) My understanding from looking at the DX7 
> emulators in the Csound catalog is that they work with phase rather 
> than amplitude, but I don't understand this. Can someone explain this? 
> Is it a simple concept or is it complicated?
>
> Mike
>
>
>
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> You can get more information here on my website: http://fggp.org/en/crossfm/

Nice. I had not seen this before. Thanks for sharing.