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recieves the button press "G3". the app looks up the 73rd FID entry in the playlist.

Aha. That'd work, too, and wouldn't require updating some kind of second list on an intermediary device. All you'd need to do is make sure the playlist is ordered correctly. OK, I'm with ya.

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However, the ideal way to do it (and save $99) would be to find a single GPIO input pin that the app could read. The app would listen for the pulses and count them to determine the buttons pressed. Any suggestions as to what gpio to use? (e.g one that I can read from user space)


I seem to recall that the PCA version of the tuner module deliberately included some general purpose I/O lines that you might be able to mess with. If you happened to have one of those. If not, then you're not really saving the 99.00 because then you'd have to buy a PCA tuner.
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Tony Fabris