Hi Ingo

> please tell us your results with your a121/a122 attempt.

So I tried yesterday evening. I have no *.mp3's, sorry. I tried to
imitate your example with a beat. In general the sound is different with
two separated filters, becaus the cutoff frequency never is the
identically, and also the phase relations are separated. This makes the
filtered sounds more vivid and less clean. When the filters are
modulated by a slow LFO, the sound is quite similar; with the slow
modulation the different behaviour of the separated filters is not that
dominant. But with a modulation from the envelope follower or an ADSR,
it gets more rough and partly queeky.

A filter combination, which can not be done with the A 107 but which is
very handsome, is a notch filter with different cutoff frequencies:

-->Lowpass
/ \
Audio-> +->
\ /
-->Highpass

If the both filter frequencies are set to suppress the mid range
frequencies, the beat becomes very vivid and fits very good in the mix,
because now there is much "space" in the middle for other sounds.


Florian