Julien,
julien.breval@tremplin-utc.net wrote:
but I forgot to say this will be done in realtime with an instrumentist, so maybe it's difficult to control this ... the only thing I can do is to decrease the microphone input level at these moments
You could use the [limiter~] from Zexy, I think also Unauthorized has one, and set the limit low enough to prevent your peaks from getting too high.
I use a lot of comb filters, where the same input is recycled at a very fast rate [which of course gives the characteristic frequency response of the comb filter], but my inputs tend to be pretty low anyway. But I have had situations where the whole thing "blows up" because of too high an input level combined with too short a delay, so I know what you mean. So pix is right...catch the level before it gets to the loop.
best, d.