I am using the Echo audiofire 4, for both midi and audio on a toshiba dual core lappy 1.8ghz with 2 gig ram thru Sonar Producer 7.

The Echo doesn't have the "bells and whistles" of some of the others but it DOES deliver superb audio through clean A/D-D/A's and smooth super sounding pre's on the mic ins..

Not sure what they are as I don't really care because they sound so good, but if anyone is interested I can find out