31 year old cassette... poss. to improve it electronically?

[TonyRPH]

As per the subject really - I have a cassette I recorded off air (FM) 31 years ago.

Tape deck azimuth was out - I have corrected that for playback purposes. (Playing back on a more modern deck).

Overall the sound quality isn't that bad - just a bit limited at the extremes - is there any 'auto magic' software I could run it through to enhance it?

TIA.

[corradoG60]

You could give this a try, its free
http://audacity.sourceforge.net/

[ribbit]

You can't add something that wasn't there in the first place.

Fiddling with the eq may supress some unwanted frequencies and bring forward others, but a flat transfer usually works best. If your amp has tone controls, they'll do a neater job than an equaliser and the effects are reversible.