Synchronization allows multiple recording passes to be perfectly aligned on the multitrack tape.
Permitting more simultaneous timbres. Allowing for different signal processing on each pass. Allowing greater flexibility in panning and equalization. With the advent of stereo instruments it is common to have each pass recorded in stereo, using two tape tracks at a time. The normal flow of the recording procedure is to compose the entire sequence, then to record one or more sequencer tracks during each pass.