While there are thousands of MIDI files freely available online, very few of them could actually be played by the xylophone. With only 32 notes, the instrument is limited in what it can play without losing any notes. Also, even when a MIDI file uses just 32 consecutive notes, they might not be the same range of 32 notes as the xylophone has, so you need to transpose. Stéphane developed a tool in Python to filter out 32-note tunes from thousands of MIDI files and automatically transpose them so the xylophone can play them. And, yes, everything you need to copy this filtering and transposing function is on GitHub.
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