This snippet create a new function to allow the transformation of a polyphonic instrument into several monaural instruments.
The syntax of this function is:
\extractNote #position music
In, for example, <c e g> , c is in position 1, e in position 2, and g in 3.
In the example below, the first staff is the original music, and the three others have been made with:
\extractNote #3 \music
\extractNote #2 \music
\extractNote #1 \music