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The scilab implementation is available here.
Sparsification
Bass
Shape parameters : original = 1.6, target = 0.8, obtained = 1.2
Piano
Shape parameters : original = 2.1, target = 1.05, obtained = 1.7
Informed source separation of a singing voice + piano mix
Informed source separation of a guitar + keyboards mix
Informed source separation of a singing voices mix
Informed source separation of a guitar + guitar mix
Low-pass filtering of the histogram
Female voice
Low-pass filtering of the histogram, with cut-off frequency 1/32
Male voice
Low-pass filtering of the histogram, with cut-off frequency 1/32