I have a GS3 workstation that I'm setting up for building arrangement demos. The workstation is more than adequate (P4 2.6, 1GB Ram, Large data drive etc.), but I'm having trouble deciding on an I/O card.

I'm thinking optical (ADAT) so I can go digital to the d8b and record to an MDR, but I'm still confused about how many ins and outs I need.

If a build an orchestra within GS3, how many output channels do I need? lets say I want all instruments (or sections) to be stereo, and go to separate channels on the hard disk recorder.

What are the most popular I/Os that are being used, and how many channels should it have? Thanks for the help