Couldn't you just use 'dd' to copy the entire partition to a file? What other stuff is in that partition? I'd imagine that the current song, or similar is also stored here.

Yes. The next step towards reverse engineering it would be to copy it with dd to a file, change a single preset in a minimal way, then copy the partition to another file and compare the two files. Doing one change at a time in this way would probably tell you where most of the information goes.

I don't have a tuner yet so I'll have to pass on this for now.

Borislav