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It works well, e.g. in the nearly-A-capella part in the mid of Augenleuchten http://www.myownmusic.de/suedwestlicht/play/?songid=422839

I think you just messed carrier and modulator.

CALF Vocoder sits in a 4 channel audio bus. The carrier comes from a fluidsynth choir and is routed to the first 2 inputs if I remember correctly (if all else fails abuse an insert send in that midi/synth track). Modulator (voice) goes to input 3 and 4. Output is at 1 + 2.

To get the latencies right do it like this:

- audio track -> subgroup bus 1 -> mastersubgroup bus -> master in
- midi track -> subgroup bus 2 > mastersubgroup bus -> master in
vocoder controlling tracks insert sends -> vocoder bus (4 chan) -> master in

This aligns latencies due to the vocoder processing that are the more audible the bigger your buffer size in jackd is (up to 4096).

This is a brain dump. If needed e-mail me at holger@marzen.de and I'll check it again how I did it in that song.