I have an
M-audio firewire 410...It's quite pricy and but its external and may be of great use for quite a long time. It has an optical and coaxial digital in, and an optical and coaxial digital out. So a totat of 2 digital ins and 2 digital outs.
heres the specs.
4 x 10 FireWire audio interface
192kHz stereo out
2 x 8 24-bit/96kHz analog I/O (1/4†TS)
dual mic/instrument preamps (Neutriks XLR/ 1/4†TS)
global phantom power
66dB available preamp gain
S/PDIF digital I/O (coaxial/optical) w/ 2-channel PCM
digital I/O supports surround-encoded
AC-3 and DTS passthrough
1 x 1 MIDI I/O w/ bypass for stand-alone use
2 headphone outs w/ individual level controls (1/4" TRS)
stereo monitor level control
low-latency software monitoring
direct hardware monitoring
8 analog outs can directly drive up to 7.1 surround
software-controlled mixing and routing
software-assignable level controller
powered via DC supply or FireWire bus*
2 convenient high-speed FireWire ports