There are other posts on these fora about the dearth of replies, so I thought I'd buck the trend
From the NCH stable, what you want is Golden Record. I haven't tried it, since I only been using their software (Wavepad and Switch) for about 2 hours, as a replacement for Steinbergs now obsolete offerings. If the quality of these so far carries thru NCH might have a future!
From long experience though, software post-processing can give cassettes particularly a whole new lease of life. You take a sample of 'silent noise' from the tape, subtract it from the recording, and it comes out amazingly bright and shiny, tho I'm only assuming Golden Record can do this. Trun the dolby on the player off, it never worked right anyway
HTH - a convert