The algorithm is mainly based on the ideas described in:

M. Spiertz and V. Gnann, "Note clustering based on 2d source-filter 
modeling for underdetermined blind source separation," in Proceedings of 
the AES 42nd International Conference on Semantic Audio, (Ilmenau, 
Germany), July 2011.

The algorithm needs less than 5 minutes for the test excerpts on an 
Intel(R) Core(TM) i7 CPU with 2.93GHz.


-- 
Dipl.-Ing. Julian Becker
Institut for Nachrichtentechnik (IENT)
RWTH Aachen University
D-52056 Aachen
Tel: +49-241-80-27676
Mail: becker@ient.rwth-aachen.de