See the waveform of your master as it plays. Zoom in to see a single cycle of a bass note, or out to see whole bars.
Lock the scope to Live from 1 beat up to 16 bars. The downbeat is always on the left, with bar numbers, a grid down to 1/16 and your locators, so you see at a glance whether the kick lands on the beat and how a sidechain breathes.
If the beat sits a little early or late, choose Calibrate Beat Sync in the scope's menu. MasterBar plays Live's metronome for two bars with everything else silent, measures where the clicks land and remembers it for this Set.