I thought about how awesome it would be to have sound when someone pours a beer. Now that V2 and the flow meters have arrived, this dream has come true.
Good info here and thanks for taking the time to write it up and share.
I'm doing something similar but I have mine playing random clever/funny lines from movies (Caddyshack, Airplane, Talladega Nights, etc.) but I have mine connected to the PIR so when it detects motion, it turns the RP display back on and plays one of the audio files. I put all of my audio files in a separate directory and the program just randomly picks a file to play.
I am thinking about adding an audio file for each beer with more information about the beer. So when the tap is pulled it plays the info about that specific beer. When I get to that point, your code is just about all I need.