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Help with the TunePlayer and TuneQueue()

I'm having trouble getting the QuickTime TunePlayer to work
properly. I wonder if anyone can clue me in on what the
"rules" are or if there is another way to use the TunePlayer.
I've looked at both the QTMusic.c sample code and the
QuickTime Music chapter of the developer docs.

I'm finding it difficult to get sounds produced in the way
I expect based on fields for pitch, velocity and duration.
In particular:

- A note with velocity zero does not seem to be a supported thing.
It stops all tune playback, instead of just silencing the sounding
pitch.

- Duration does not seem to always be honored. Subsequent events
seem to be able to truncate a sounding note and I haven't figured
out the rules for this. Sometimes a rest event seems to trigger
this, but other times a rest event will just mark the next event
and not end sounding notes.

- Rest events seem to be required even when there is no actual
rest, as a way of telling the tune player when the next event
starts. I've had some success with this approach but the item
above still applies.

Right now I'm only using extended-note events and rest-events in
the actual tune sequence (plus the end marker). What I'd like
is to figure out how to make the TunePlayer work basically the
same way a live Note Channel / Note Allocator component works,
or at least clarify the rules.

Can anyone offer any advice? Is there any better example than
QTMusic.c?

Thanks in advance,
Christopher
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