faint precession of sound on vinyl

Print though on tape is the reason they are stored tails out.

Rwwear...I didn't know that. Can you explain how this helps.

If it was the stylus reading the signal on the adjacent wall wouldn't it change channels? I notice it is always on the same channel it is preceding.

I am just going to go back to what I have done since I was 9: ignoring it.

Deaf_j...The playback stylus does not "read the adjacent wall". It is reading its current groove, but that groove was corrupted by the adjacent groove when the record was cut.

As to which channel is affected...it is horizontal groove modulation (mono) which is the problem. (Vertical groove modulation doesn't affect groove spacing). So, the pre-echo signal will be the mono component of the next groove.