Hum I know mpd/mpc (I have developped a client for it for GNU Emacs). I know what they do and how. When talking about "heavy" mediaplayer, I am talking the one that one is susceptible to install via the application manager.

I have tried canola. It looks good but it is a shame it can't find any music (ogg or flac files). When refreshing the media library it takes ages to finish just to be presented with 0 content. So this is pretty useless.

Ukmp: it finds my files (wow wow) but the volume is so high (and I really do not know how to change that from ukmp) that it is horrid and I'd rather want not to listen to music at all instead of the noise.

I am about to install kagu to try it out too.

To give you an example of what I think a good audio player is, just check amarok. This is the best (graphical) media player I have ever seen.