Looks like the sound was connnected to the ESX amp (visible just behind the computer in the pics) at that time. Subsequently it was said that the whole setup was going to be connected to the Nakamichi MB75 stereo aux-in. That's my guess, anyways.
Mine is connected directly into the head unit itself (kind of like an aux-in), through some small modifications I made.
Player: Pentium 166MMX, Amptron 598LMR MB w/onboard Sound, Video, LAN, 10.2 Gig Fujitsu Laptop HD, Arise 865 DC-DC Converter, Lexan Case, Custom Software w/Voice Interface, MS Access Based Playlists Car: 1986 Mazda RX-7 Turbo (highly modded), 1978 RX-7 Beater (Dead, parting out), 2001 Honda Insight
"If one more body-kitted, cut-spring-lowered, farty-exhausted Civic revs on me at an intersection, I swear I'm going to get out of my car and cram their ridiculous double-decker aluminium wing firmly up their rump."