I downloaded the package, but my opinion is that the audio is not of good quality, and most importantly, the captured notes are too long and contain too much information.
From how I could test the app, the information of the notes should be shorter, (for example left, 5, long, close, 4) so you can merge them, where it is needed in the track.
I've seen a few videos of Marc Marti, and it's in his way to give the notes, very long and repeated often twice the notes, surely for the choice of his driver Dani Sordo. that's why I think it's very difficult