When you need to sync the S2400 to a non MIDI instrument (like turntables), tap tempo is a good tool to find the BPM of a track, but you may need to push forward or backward the tempo to perfect match, like with a turntable.
It could be done with keeping tempo pressed, then >>> or <<<
Or you could adjust the speed on your turntable for the easy fix - alternatively you can start / stop the track on the s2400 while adjusting the speed or buy the Octatrack that already have this feature