I got my first 14 inputs from an Aviom AN16/o output module. This module provides either mic or line level outputs. I was able to control the signal level with the inputs on the US-1641. Inputs 15 and 16 came from an M-Audio 1410 firewire interface. I used the digital outputs of this unit. I was very surprised that I could use both interfaces at the same time with no problems.
The recording was mostly an experiment of how much I could throw at the system to see if it would crash and it didn't. I didn't use any plug in's during the recording. The concert was about If you want to check out some of the songs I recorded follow this link.
http://www.myspace.com/verge748music