i have quite a problem:
Im working on a piece, where i use a bank of bandpass filters (four
parallel cascades of two biquads at gain 1 and Q bout 15 on every one
of the four input channels) to loosely imitate the resonances of an
instrument. The output of the filter should then be reverbed a lot to
generate a cloud of airy sound. Here seems to be the problem: Reverbing
the filteroutput more or less amplifies it, as it is present over
longer a time and gets accumulated. Thus the whole thing is extremely
prone to feeding back into the filter...
I've tried building feedbackdestroyers with fft, but when those shut
enough to kill the feedback, i cant get anything else past them into
the filter. i've tried working on the reverb settings (used newverb) as
well, but when i got the feedback under control, the reverb level was
almost impercrptible over the direct sound from the instruments -
timpani i forgot to mention...
Could it just be a problem of the very unfavorable accoustics of the
room in which i' m working, - its small and the instruments are in a
corner, so i get a lot of reflection from the walls and the ceiling,
and the huge membranes reflect everythig into the mics. Its not just a
problem of the newverb, if tried other devices as well...
Any ideas how to get a sort of tuneable resonator/filter bank without
the self exitation problem?
i'll try to get an isolated patch without any externals missing for