After searching through a few plugins, yours looks awesome, so I'm dead keen to use it on my site. However, I'm running the minimalist theme on my site and for some reason, it seems to stop the WPAudio links working.
When I switch back to the default theme, it works a treat, so I know there's something going on in the stylesheet that's ballsing things up. Any chance you could have a look for me?
Current site is at http://www.rohanbynightfall.com/rbn. But equally, try installing the Minimalist theme.