Issue 153 in lilypond: \once \set fails with MIDI instruments

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Issue 153: \once \set fails with MIDI instruments
http://code.google.com/p/lilypond/issues/detail?id=153

Comment #3 by hanwenn:
unfortunately, there is no place to store the pre-\once value, so it can be 
restored
easily.

Chanign to enhancement, since this hasn't ever worked; perhaps it needs 
clarification
in the manual.


Issue attribute updates:
        Labels: -Type-Defect Type-Enhancement

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