Change bpm

here's the calculation

when making a sample faster:

you divide the desired tempo by the given tempo (i.e. 96/64) but then you subtract "1" off this result and then multiply by 100

((96/64)-1)*100 = 50

this result (50) would mean 50% so you'd have to make the 64bpm sample faster by 50%

if you have a 33 bpm sample but want a 99 bpm sample (99/33 = 3.. 3 - 1 = 2 .. 2 x 100 = 200%)

to check this equation you can caluculate with the same bpm

i.e. 64/64 = 1
1 - 1 = 0; 0 * 100 = 0% so you would have to change a 64bmp sample by 0% to achieve a 64bpm sample


when making a sample slower:

you calculate (1 - (desired bpm/actual bpm)) * 100

to check this calculation:

actual bpm: 96
desired bpm: 64

(1 - (64/96))*100 = 33.333%
so you would have to make the sample slower by 33.333%

actual bpm: 99
desired bpm: 33

(1 - (33/99))*100 = 66.666%

so you'd have to make the sample slower by 66.666%

last check with same bmp

(1 - (64/64))*100 = 0%