How to compare a remix with the original
A/B switching only works when both versions play the same moment at the same time. A remix with a longer intro, a radio edit or a re-recorded take puts the shared material at a different place in each file, so a plain A/B jumps to a different part of the song. The fix is to line them up first.
Find the shared material
Pick a point both versions have in common: a vocal entry, a drop, the first chorus. Shift one file in time until that point lands at the same moment in both. From there, everything that follows the same arrangement plays in sync.
This only works while both run at the same tempo. A tempo change would need time-stretching, which alters the audio itself and defeats a bit-perfect comparison.
Check the alignment by ear
Waveforms get you close; your ears finish the job. Play a passage with a sharp hit, a snare or a consonant, and switch back and forth on it. If the hit seems to flam or jump when you switch, the versions are a few milliseconds apart: nudge one until the switch lands cleanly and only the sound of the version changes.
Trim to the part you are judging
Long intros and outros that exist in only one version get in the way. Trim both to the stretch you want to compare, the drop or the chorus, so playback starts there and stops at the end of it.
Doing it in audiotoggle
Open Align & trim above the waveform:
- The waveform doubles into an A row and a B row on one time axis.
- Drag either row sideways until the shared parts line up, or press Auto-align to find the offset from the music.
- Drag the IN and OUT handles to trim both tracks at once; the cut parts are hatched.
- Press Apply. On Pro the alignment and trim are saved with the comparison and its share link.