Feedback in FM synthesis

[Ingo Debus]

WeAreAs1 at aol.com wrote:
> 
> In a message dated 8/6/00 5:56:24 AM Pacific Daylight Time, debus at cityweb.de
> writes:
> 
> << On the DX7 there are some algorithms that offer feedback over several
>  operators. And on the SY/TG77/99 you can freely set the feedback path
>  from anywhere to anywhere. >>
> 
> If I am not mistaken, the SY/TG series allows the user to freely set the
> feedback path, but the feedback still originates from only one operator
> (please correct me if I'm wrong about this).

Just had a look at it, I was wrong. The choice of the feedback path(s)
is not exactly free, since only some (normally three) of the six
operators can act as source for a feedback path. But there are three
feedback paths with three different sources possible in an algorithm.
Man, I've had this TG77 for such a long time and still haven't tried all
these possibilities...

>  In the DX series, the feedback
> path is preset within each of the 32 algorithms, and the feedback always
> comes from only one operator (I'm sure about this).  However, in many of the
> algorithms, the feedback may come from an operator that is "at the bottom" of
> a stack of operators, and it may feedback to the "top" of the stack,
> essentially giving a result that would be similar (but not identiacl) to
> having multiple feedback paths within the same "stack"
> .

Yes, that's exactly what I meant. Sorry for being unclear.

Ingo