[smelendez]

I've played around with techniques like this too.

My thought was to make a multimedia tape zine where people could submit songs and accompanying short text. One track of a stereo cassette track would store the audio mixed to mono, the other would store the text encoded something like this. You'd play the tape in a cassette player outputing to a computer that would play one track to a speaker and decode the other to a thermal printer, so the text would also appear on a "tape."

The problem is, it's really hard to find working cassette players with stereo input and output...

[White_Wolf]

I'm sure there are others but you can still find a 1980's Sharp 555 double casette players. I have one and had to do minimal maintenance on it and a bit of patching up. If you're not into repairing the electronics it's not a problem. pretty much any repair shop can get these back to working state. You can also find schematics on russian/asian DC++

[robotguy]

I've been a bit obsessed with the idea of running an 80's themed ARG, and this would be perfect.