I bought a bush internet TV box IBX200 and took it apart, pictures to follow soon.
Reawakened in my interest in these boxes by the discovery of several useful web sites :
Bush hacking mail list : http://www.earth.li/cgi-bin/mailman/listinfo/bush-hacking
Vincent Sanders excellent site at : http://www.kyllikki.org/hardware/bushstb/
Chris Sawers site on getting Linux up and running : http://www.sawer.uklinux.net/bush/
Richard James's site : http://www.wimborne.org/richard/bushinternet/
The Bush internet TV boxes have no audio capability but the PCB apear to have space to add the parts.
I have drawn a circuit diagram for what I think is the IBX101 audio section : ibx101_audio.pdf. With Thanks to Ralph Barrett for his help.
Data sheets for two of the ICs used are here : TDA1308.pdf and TDA1545A.pdf
I am in the process of adding these parts to see how I get on.