Just thought I should mention that in the XMF-WG the MMA is
considering a file format for the interchange of MIDI+Audio sequencer
sessions, using the SMF track format for the sequencer track
representation, with the audio clips placed on a MIDI timeline via
new SMF meta events for Audio Clip Instance. And that in our
discussion of sample-accurate audio clip sync there, the seq
companies generally agreed that the audio sample clock should be the
timebase master, and that the MIDI timing should be derived from
that. However the existing SMF Set Tempo meta event was found to be
lacking in resolution, i.e. couldn't guarantee sample-accurate
placement of audio clips, so the current proposal is to define a new
Set High Resolution Tempo SMF meta event, which would set the number
of microseconds per SMF tick (the musical time sprocket hole for
SMF), with a 24-bit integer part and a 24-bit fraction part. When
you do the math analysis on that, it turns out to gives extremely
smooth tempo granularity, way sub-sample timing resolution even for
futuristic sample rates, and can still cover an .extremely. wide
tempo range for all reasonable ppqn values.
Just FYI.
-- Chris
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