As you can see from the spectrograph, there are two melodic lines in this excerpt. These two voices are played by different instruments. Is there a tool (preferably free) that will allow me to extract one instrument out of this mix?
A basic approach would be to extract just the peak frequencies as circled, but I don't even know where to start on that. To also get the timbre of the instrument would require extraction of the overtones as well.
This piece was probably mostly computer generated and contains very pure tones, so I imagine this task would be at least somewhat feasible.