Hi Germain,
In standalone mode in my demo version i have found that if i select a stereo input, then only the left channel is sounding.
If i select only Left as input (a mono signal), then there is sound in both channels.
The Pitch Tracking in Vocoder V according to the manual only work with a monophonic signal.
Also the manual say this when using samples: "(The samples can be stereo, but they will be summed to mono prior to being vocoded.)".
So shall we understand, that this also should be the case when using a stereo signal for Voice input mode?