Yes, I am fully familiar with the mp3 licensing as its translation was always regulated and quite well known, much like jpeg in the photoshop world. The audio detection I always got the impression was developed by the Scaler team since Ed spoke about it with a bit of pride as it compared to others doing similar detection. In any event it’s all speculation on your part as you said.
There was another thread I pinged you on about the exporting of chord sets under the USER menu and if you had done a study on it as you often do. So if you have any expertise on it the thread is here Saving and Recalling User Chord sets - How?