Oh yes, how I wonder such user tracks can be produced out the piano recordings of her. Here’s a simple way to do it:
To find them, do it with the help of sound editing programs like Audacity or any other software from the DAW family, to delete the noise or edit the level of the sound if that is what she needs.
If you want to make several loops or to provide particular parts of the tracks as accessible as possible, just divide the track into parts.
Instead, move those segments into the recording software’s user track function (refer to your program’s manual for most programs, this is simple).

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