Thank you Audioarchivist, that is exactly the kind of information I am looking for. Some people claim these is no difference between a Pre-FM and a master recording (be it sbd or say mics onstage), but it seems this recording was also prepared as a Pre-FM, with the tone at about 16 KHz actually injected into the master. Many shows from this venue ended up being broadcast on FM, so it all begins to make sense.
I was looking though some old posts, and in
this post ssamadhi97 identified a Westwood One promo CD (Toad The Wet Sprocket1990-04-11 Live at Park West) with the same stripe. Another true Pre-FM(?).
I would love to know "why" they put that signal into a pre-fm? Is it getting used for something, like pitch correction on playback over the radio? Or something else?
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