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implement aubio_beattracking_set_target to set target tempo #392

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@tqzamf tqzamf commented Aug 1, 2023

the tempo tracker currently defaults to tracking around 120bpm. adds a new method aubio_beattracking_set_target (and corresponding getter aubio_beattracking_get_target) to set this to other values.

my application is beat tracking when I know the input is around 150bpm. I can easily provide the likely center value, but having the tempo tracker randomly drop back to 120bpm when it loses track isn't acceptable. thought it might be useful for other people too.

otherwise the tempo tracker tends to see 120bpm everywhere. this is fine by
default, but in some situations we have additional information that the input
is close to e.g. 150bpm. there is now a way to convey that information.
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