<Florian.Anwander@c...> wrote:

> Also we have three different techniques to build an audio delay:
>
> A.) BBDs (Bucket Bridge Devices).

A BBD based delay doesn't seem like a good idea because the chips are
scarce and there are already other VC BBD delays.

> B.) Digital memory based delay, A/D-converter has a constant clock:

This is, as you point out not so desirable because it simply trims the
end of an echo off as you change the delay time which in my opinion
isn't desirable for a voltage controlled delay.

> C.) digital memory based delay, one clock for ecerything (A/D, memory
> reading, and D/A).

I vote for this option. It means that changes in delay time also
result in changes in pitch which allows for lots of nice effects in a
voltage controlled module. A digital module should also allow for
infinite looping and other features of some of the simpler looping
delay pedals. I don't know of any well-featured digital delay modules
with CV controls so I think this would be a pretty unique and useful
module. I don't see any reason why one module couldn't range from
short Karplus Strong style tunable delay times (possibly quantized )
up to long, infinite looping delays (preferably with a sound-on-sound
feature). Perhaps a range or mode switch could toggle between these
two functions.