I posted a fix in the development forum for the instrument issue (not for the song modifier issue). It simply allows instruments to work as they should in regards to them being equipped. Additionally, it fixes the problems with bard songs dropping before they are refreshed (which screwed up bard invis working). I don't think it was ever committed, however.
The song modifier issue is trickier..when I was working on it with the last release I couldn't immediately see how the client knows if there is a modifier on a buff he currently has applied, or a new buff that was just applied - I didn't do a lot of testing in that area, as there are a fair amount of unknowns, so maybe the bard song modifier's offset isn't known?
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