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by ekphrasis 2740 days ago
According to post #5 in this Lemon 64 thread[1], sound cards or TV amplifiers may invert signals from tape. I have actually just tried it when running recorded tapes in emulators but it has proved useful in cases when non-inverted tapes have failed to load.

[1] https://www.lemon64.com/forum/viewtopic.php?t=45206