The source for my WIP music visualiser can be found here:

https://gitorious.org/meego-music-visualisation

A pre-compiled version can be downloaded here:

http://mikeasoft.com/~mike/music-vis....1-1_armel.deb

There's a short video of it in action using two different visualisation plugins (monoscope and goom) here:

http://youtu.be/N2d7evnpoCU

As I mentioned earlier it only works with speaker output due to bugs in the headphone monitor's time-stamping, and it's very much just an initial work in progress. When I ran in to the bug with headphone support I decided to just shelve it and wait for the Jolla phone before doing any more with it, but it might still help anyone wanting to take this on.