Ah, the age-old question.  It comes up all the time.

It appears from the existence of the problem and from other things I have
tried in the past that there is no such thing as "sending a track mark."
There appears to be no code in S/PDIF that says, "new track NOW!"

Track mark positions are inferred, as Rick said, from such things as changes
in the track number bits, or the SCMS status, or the sampling rate, or per-
haps the source medium ID, or by transitions from out-of-track to in-track.

If software to generate S/PDIF from computer audio files would deal with
those indicators, it could be done.  For example, if you set it to play
fifteen .wav files at once, and it sent 1 as the track number during the
first one, 2 during the second, and so forth, then there would always be a
change of source track number for each change of source file, and the
recorder would be able to mark tracks.  Or if the software sensed the
proximity of the end of the file and set the in-track bit to out-of-track
for the last several seconds, that should do it as well.

If any of those methods could be tried and shown to work, then there wouldn't
be any need for interspersing silence, which, as our loud DJ friend said,
would ruin recordings of mixes.  (You could always delete the silences later,
but that's a royal pain to get exactly right.)

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