GNMIDI

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Cripple notes
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dialogcripple

[in menu Modify/Note operations]

This operation encrypts the notes of the MIDI song. This is useful for making MIDI file unusable for printing or editing. The operation can't be reversed.

Two different methods are available:

Chaos Encoder
creates a little chaos in the song, the commands are moved into random tracks which causes bad printings but still plays correctly.  
 
Pitch Encoder
changes notes by random half tones and uses pitch bending to put them back to pitch.  
 
Hint: Check carefully if the song plays identically after cripple operation, since the operation applies changes to the notes and pitch bending.