Audio source backend is not configurable

[Laszlo Pandy]

Just as you can switch between audio sinks, (autoaudiosink, alsasink, custom), you should be able to configure which audio source is used. Allowing a custom element to be used as a source would probably not be difficult. Currently you can set a custom source for the gconfaudiosink, but Jokosher is hard coded to alsasrc. It is likely that many people would want to use pulseaudio (pulsesrc) as their input, or simply the gnome settings through gconfaudiosrc.