Allow us to half or double bpm in batch
This will be mighty helpful for DJs that play multi genres.
E.g. all the 60ishh bpm songs that are detected as 120ishh, 70ish detected as 140ishh
And vice versa
A way one can select everything and just half the BPM or double it. Say I make a selection containing 120 and 140 bpm songs and I half the BPM of the batch they should change to values of half the bpm of each song.