I’m using the word ‘tracks’ here to mean when you divide a long audio recording into sections (to be exported as separate files). Not as in multi-track.
When cutting out a section of a recording, I am aware of the need/benefit of using Zero Crossing points at the joins.
What I cannot find advice on is whether this same technique is needed at track boundaries. No data is missing at the boundaries, so there is no sudden transition if you play two consecutive tracks later (assuming gapless playback). However the track boundary could be on a peak, and if you played just that track in isolation, might you hear a click at the beginning/end?
In other words, is it common practice for commercial CDs to have zero points at all the track breaks (particularly necessary where tracks are crossfaded/blended)?