This tool is based on the "aero" audio upscaling project (original version, modified version used here). It takes digitized radio recordings and attempts to reduce noise/interference while recreating lost frequencies.

The FM model should be able to:

Reduce stereo hiss
Reduce certain kinds of static/interference
Reduce 19khz stereo pilot
Reduce overly warm bass frequencies (boost them 3 or so dB if you miss them)
Restore lost high & low frequencies (generally only up to 16 khz since most training data is MP3-based)

The AM model should be able to:

Reduce certain kinds of static/interference
Restore lost high & low frequencies (capacity tends to diminish after 10 khz)

The Telephone model should be able to:

Reduce certain kinds of distortion
Restore lost high & low frequencies (capacity tends to diminish after 10 khz)

Known Issues:

The FM model is much better at removing noise from the stereo (L-R) signal than the mono (L+R) signal
The AM model tends to produce artifacts/sibilance in the 6-9 khz range, particularly in the 7-8 khz range