[davidzweig]

Any tips for models that can restore speech quality on aged cassette recordings (often the higher frequencies are partially lost)? There's different approaches to noise reduction, and also audio super-resolution, but I didn't find anything geared towards old tapes specifically.

[daniel_reetz]

There's a piece of commercial software called Celemony Capstan. Might not be right for your application but it was designed explicitly for tape restoration.