I thought MusE already did this and it just lacks an easy way to define (most likely draw) a gradual tempo change on the GUI mastertrack editor?


On Mon, May 6, 2013 at 11:33 PM, Florian Jung <florian.a.jung@web.de> wrote:
Hi

i'm just wondering where the time stretchers shall receive their
keyframes from. all of these considerations will only affect the
accurateness of time-stretched wave parts/events.

basically there are two ways:

1. always conform to the tempo map.
   this will work very fine when the tempomap is actually used, and is
   not changed "live".
   this will also work fine when MusE is running on external tempo sync,
   but the external tempo hasn't changed.
   MusE would then, during the last (full!) playback, record the
   externally supplied tempo, and use this (old) tempomap for the new
   playback.
   this WILL glitch when the external tempo changed. because then, MusE
   still adheres to the *old* tempo map, which is out-of-date.
   this MIGHT glitch when the user edits the tempo near the playing
   position *while playing*. Or uses the 200% / 50% button.

2. do weird guesswork, resulting in un-understandable code, and non-
   optimal timings whenever there's a tempo slope. especially this will
   also happen when there's a tempomap available, and while the final
   downmix!

3. even weirder hybrid of both.


Basically, i want and probably will go with 1.

But is it okay for the user, that "unexpected" tempo changes might cause
a single glitch during playback? Playing back a second time won't glitch
any more, because muse knows about the new tempo map then.

Just say "yes" :)

greetings,
flo


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