The phaser modules A-101-3 and A-125 can be used as allpass filters provided
that only the effect signal (not mixed with the original signal) is used.
The normal phaser sound (with several notches in the audio spectrum) appears
by mixing the allpass signal with the original signal.

Best wishes
Dieter Doepfer

> As far as using an allpass filter is concerned, the only one in the

doepfer

> range, that I am aware of anyway, is in the a107, which is a fairly
> expensive module, and I have no idea of how good it sounds.