[ekphrasis]

A key method I've learned through various sources for ensuring good conversion from WAV to TAP is to invert the whole waveform in Audacity through Effects -> Invert before the actual conversion process.

I can also recommend the command line tool UberCassette for easy conversion: http://www.retroreview.com/iang/UberCassette/

[mrspeaker]

Huh, that's weird! How does inverting a waveform affect the process?

[ekphrasis]

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