frog:
The tricky part of building a Beomedia 1 is twofold; the B&O PCI board in the box which handles ML, and the fact that the software runs on Windows XP Embedded. The Beomedia app seems to be a Flash app. Now if the drivers from the PCI card could be removed, then that could make a very interesting option!
Spend a lot of time last on this subject, due to my back injury, so..
The ML board acts as a USB PC Link2 module. (Look under Device Manage where the ML board is recognized as PC-Link2). But the board converts also the digital audio to analog with a neaty DAC.
You can replace the ML board by PC-Link2/Beoport module and programme the firmware from the Beomedia ML board (1.89) into the Beoport module by using the MAC BMLink program. Normally the Beoport doesn't go further then 1.31. Then you will need the onboard audio device or a third party audiocard to feed the PC-Link2/Beoport module.
The ML board is also a USB board where on the back (vertical) is a 4wired cable on a 5 pins connector. Thats the USB entrance for the board.
But to take another pc to act as a beomedia will have some difficulties.
You need the Beomedia software and that has the to work with the OS. And I can tell you in advance that the Web function will give you the most trouble. It only cooperates with Internet Explorer 6. And that version will not handle the latest flashplayer well.
Last year I had the Beomedia software working on another system with a AOpen AX4PE/AX4GE Tube mainboard. For audio it has an old fashioned tube.