Cool!
My own experience is that the individual settings rarely if ever needs any tweaking so the main concern for me has always been to check up the audio source instead. It is of importance as it dictates whether alchemy is needed or not at all. The only time I had to adjust the settings is when I hear glitches and then usually the buffer setting needs to be adjusted upwards but sometimes downwards. I have never had to adjust duration or voice count. The default settings just works 99.99% of the time.
But these are answers on question you did not ask, with that said, I can't answer exactly what they are or how they function. I mean voice is probably channels but the other two I don't know.