I've been reading about MIDI file structure as I'm interested in writing an application that would read/write files in this format, but I'm a little confused about time divison in the header chunk.
My understanding is that this part is essentially 16 bits, where if the sign bit is 1 the remaining bits specify an SMPTE timecode, and if it's 0 then the bits specify the number of ticks/pulses per quarter note (PPQ).
My questions, specifically, are:
- What does a higher/lower PPQ do to a MIDI file? Does this change the quality of the sound? My understanding is that it does not affect tempo
- How does the SMPTE timecode affect the MIDI file in playback?
Essentially, I'm trying to understand what these actually mean to the end result.