For a school project I'm working on instrument classification on multi-instrumental tracks. To do so, I'm following Arie Livshin's modus operandi, and I would like to get a good software to perform source separation: given a multi-instrumental short extract, getting n (with n being equal to the number of instruments) tracks with more or less one instrument per track. 

The best I've found so far is the FASST toolbox for Matlab, but the result on a saxophone/guitar song was quite disappointing. Have anyone encountered something better I could use?