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A Couple of Midi Tempo and TimeSig Questions
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A Couple of Midi Tempo and TimeSig Questions


  • Subject: A Couple of Midi Tempo and TimeSig Questions
  • From: Peter Zegelin <email@hidden>
  • Date: Wed, 14 Apr 2004 23:22:42 +1000

Hi,

When Core Audio builds its special Tempo track does it only look for Tempo and TimeSignature events in track 1 of the Midi file? The reason I ask is that I've only ever read that Tempo and TimeSig events are *supposed* to be in track 1 but not that they *must* be in track 1. For cross platform reasons I'm generating my own list of these events and want to make sure I'm doing the same thing as Core Audio.

Also is there any default maximum Tempo value? I'm generating a fairly standard squiggly line type Tempo view and was wondering what a reasonable maximum might be. At the moment I am actually calculating the maximum tempo for the current file and using that, but is there some sort of standard?

Finally I have a slightly off topic question regarding TimeSignature events. From my (limited) understanding of music theory, a time signature must be for a whole measure i.e. you cant change time sigs in the middle of a measure. However, the way midi is set up it is actually possible to do this even though it would be incorrect. Is there some sort of standard on how midi players (or Core Audio) handle this situation? Do you just finish the measure when a new timesig event arrives and start again from that point?

thanks!

Peter
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