A USB-MIDI interface is 100% the way to go, but I would personally avoid those $11 MIDI interfaces like the plague. I've seen more of them fail than work. smile

An interface by an established company like Roland or M-Audio would still be very affordable, and will be a lot more reliable.

We sell the Roland UM-1 here: http://www.pgmusic.com/rolandum-onemk2.htm and pretty much every music retailer will have a few models for similar prices that you'd be able to count on.

Tangmo, you'll want to connect the audio out of the synth to the Line Input on your audio interface. Which model of interface, and which synth did you get, by the way?

Cheers
Kent
PG Music