Check out Amulets (a great musician) who once sold a variable speed tape player in his shop [1]

There's also the fascinating OM-1 Cassette Tape synthesizer [2] -- it varies the pitch of the tape to produce different sounds.

[1] https://amulets.bandcamp.com/merch/modified-variable-speed-t...

[2] https://ask.audio/articles/om-1-cassette-tape-synthesizer-is...