How to change default "app" settings in Streamtuner

[Patrick Chiang]

Hi,

I just started using StreamTuner as my Internet radio program,
it worked perfectly :)
but I couldn't change its default behavior to invoke external
application; it always called xmms to play music (But I prefer to Beep-
Media-Player) and Epiphany to browse web pages(Hopefully firefox).
Anybody has an idea about how to change these settings?  It seems that
no configuration files can be modified manually.

ver: streamtuner-0.12.5-1
platform : FC2

TIA,

Patrick