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I’m decoding midi files now, it is not simple, but anyway I want to do it for myself.
I know that tempo change affects all tracks, but I’m just think that it affects all upcoming tempo changes’s time. I’m just want to sure before I accept that theory.
First, to correct the comment by @sehe, MIDI tempo changes do not use BPM for their units, though they are absolute. Tempo changes use microseconds per quarter note, not beats per minute.
That said, MIDI tempo changes are not relative to each other, so you don’t need to worry about tempo changes effecting each other. Or to give an example, say you have three tempo changes in your sequence:
And you remove
Bfrom the sequence, the tempo will still be 140 BPM when you reachC. Hope that answers your question!