Question about Dividing a Long Recording

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)?

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)?

That’s a good question. I checked a few tracks from Dark Side Of The Moon and they are not cut on the zero crossings.

It could be tricky because CD files are structured as frames with 75 frames per second and the track marker has to be on a frame boundary. (Audacity can show time as CDDA frames or hr:min:sec:frames.) And, you can’t always find an ideal spot where left & right zero-crossings line-up.