On Thu, Feb 23, 2023 at 08:43:52PM +0100, Jeanette C. wrote: > In my example: I want to change the tempo from 120BPM to 150BPM over > four bars of equal length.
What you want here is probably an exponential mapping from bars or beats to tempo. For example if you want to change from 1 to 4, a linear mapping would have (1 + 4) / 2 = 2.5 halfway, and an exponential mapping would have sqrt (1 * 4) = 2 halfway. For 120 to 150 it would make very little difference, 135 vs 134.16. So if the start and end values are A and B, you would make a linear function from log (A) to log (B), and then use exp () on that to find the tempo at any point. Note that this is a exponential mapping from bars or beats to tempo, not from time to tempo (because as the tempo is changing, so does the duration of a bars or beat). Ciao, -- FA _______________________________________________ Linux-audio-dev mailing list -- linux-audio-dev@lists.linuxaudio.org To unsubscribe send an email to linux-audio-dev-le...@lists.linuxaudio.org
