So I need to install johnx's package too (first?) or is that part of the deb and other files and use its program to toggle things on? And only specially patched versions of certain programs work?

(sorry if I'm being dense, but it isn't clear which pieces are needed where and how).

If I have an n810 which has freshly flashed Diablo, and a pair of a2dp headphones, I download your programs, run the install script, and then?

(insert noob instructions)

... And the headphones have hifi stereo playing.