AW: VC delay module ideas?

[Rob Hukin]

Juergen wrote:

>Now my question.
>The main reason why I want to build a tracking (i.e.
>V/Octave) delay is the use as sound source (Karplus /
>Strong - sp? - and "poor man's physical modelling" stuff.).
>The main reason why I have not yet built a tracking delay
>is the analogue filter problem. Any analogue filter included
>in the feedback loop would detune the whole thing.
>Ok, put the anti-aliasing filters out of the loop, but you
>still *want* to control the frequency response of the feedback.
>So here you have one case where digital filters are
>superior !

The main thing that's stopped me doing this is that bbd's will usually only
give you a couple of octaves range, unless there's a trick i'm missing - i
guess you could use different taps for different octave ranges, but no
smooth transition between the two.

What about putting a VC all-pass filter in the feedback loop? Or not
putting a filter in at all but some interesting nonlinearity. (I guess my
interest is more in the noises that something like this would produce - not
necessarily tuned tonal...)

rob.