How well does this work with lossy compression? I would trust only lossless formats and analog with digital data encoded as audio, but I have zero hands-on experience with this
The bit rate of a speccy tape recording was only about 1500 bps, and we routinely recorded on the cheapest tapes, and tape machines that were little better. I'm sure it'll be fine.
Technical details for those interested: https://sinclair.wiki.zxnet.co.uk/wiki/Spectrum_tape_interfa...