Tomer's right - the UAD-1 is a DSP card, ie it has a processor in it which apparently equates to about an extra 2.8GHz processing power.
There is no Audio input at all.
I use the Audiophile 2496 but am thinking about switching to the RME Hammerfall.
For details on the Project Pack:
http://www.turnkey.co.uk/tkweb/stock...D1&context=WEB
For details on the Studio Pak:
http://www.turnkey.co.uk/tkweb/stock...SP&context=WEB
Although I wouldn't recommend buying them from Turnkey - they can definately be found cheaper elsewhere!