Back in the day I had a cassette machine, kinda crappy really, but it looked nice and I would record songs from FM radio instead of buying the album. Then I got my first Teac rtr and that was the end of the cassette almost. Bought a dbx compander for the Teac and wow what an improvement. So I tried it on the cassette and it really made a huge difference. No, not enough so that it came close to the Teac, but good enough for casual playback.
OP,
dbx equipment can be found on eBay almost all the time, heartily recommended.
Regards,
barts