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Compact Disc subcode - Wikipedia
https://en.wikipedia.org/wiki/Compact_Disc_subcode#:~:text=Subcode%20or%20subchannel%20data%20%28called%20%22control%20bytes%22%20in,used%20for%20control%20and%20playback%20of%20the%20CD.
What is "PQ Subcode"? - Sweetwater
https://www.sweetwater.com/insync/pq-subcode/
Moving track start times in a CD editing system changes the PQ subcode information. The “P” subcode is a simple music track separator flag. Its status is normally a binary “0” during the music and in the lead in track, but changes to “1” at the start of each selection. CD players can use it as a way to find track start points.
What about subcode (P, Q, R, S, T, U, V, W) channels? ISO ...
http://www.cdfs.com/cdfs-subcode-channels.html
The user data area contains three types of subcode-Q data: position information, media catalog number (MCN), ISRC code. Other forms are found in the lead-in, and are used to enable multisession and describe the disc TOC (table of contents). The position information is used by audio CD players to display the current time, and has track/index information.
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