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How much hidden audio could be stored?

Was it limited to something negligible like a couple of seconds?

Or could you store a whole five-minute recording in there or something?

There doesn't seem to be a limit, this https://en.wikipedia.org/wiki/List_of_albums_with_tracks_hid... mentions a 27 minute live recording.

Incredible! Songs in the Key of X was the only album I ever knew to do this, and it wasn't even the first. I had no idea so many others did the same thing.

Edit: Son of a *, I've had a copy of Sister Machine Gun's Burn for almost 30 years and never knew there was a hidden track!

Classic X-Files album is the one I think of too. And how they hinted to everyone that there even was a hidden track on the sleeve: "'0' is also a number". (and the technical fineprint about the disc possibly not being Redbook compliant)

I guess the limit is some milliseconds short of 74 minutes.

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