Hi,
this will depend so much on the song in question, it's impossible to give a definitive answer.
I have personally succeeded in extracting Kick, Snare and HH from a short piece of a song but again, it will depend on the material. Tracker's main purpose is to convert multi-track drum tracks into MIDI. The icing on the cake is that it works surprisingly well with just a stereo file with drums.
BR,
John
