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 #1 by hanwenn:
Hi Erik, 

can you have a look at this?  Currently, we call Context::unset_property() which
deletes the value, but I recall that we actually used to restore the old value. 
 If I
understand correctly, we won't be able to do that easily with streams, but 
please
doublecheck.  


Issue attribute updates:
        Owner: mandolaerik

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