I wonder, if it’s possible to assign each track to each voice.
In my case, there are polyphonic recordings and I would like to have each voice in the separated tracks.
Is this possible in Audacity? If not, could you indicate me the program that could do this task?
Not with Audacity.
Possibly with Melodyne by Celemony, however, the software is rather expensive, and it will be very labour intensive (will probably take several weeks of continuous work to separate the instruments of one song).
There is also the much less sophisticated “Elevayta - Extra Boy Pro”, which is much less expensive and the cut down version “Extra Boy”, but I wouldn’t expect either of these to work very well in most cases.
The “almost free” cut-down version is hidden near the end of the downloads page. http://www.elevayta.com/
These are also Windows only (VST) and I don’t know if they work with Audacity (I’m on Linux, so I’ve not tested).