Well I've got one active bass and one passive bass, both of which I used to plug in to my USB Creative MP3+ sound card. I did it via the mic port so I could make recordings or have online jams over MSN messenger, and it always worked fine until my sound card died one day. So I swapped back to my onboard sound card, which tbh is alot better, built in EQ/room modelling, surround sound, and much less distortion, however my active bass no longer works with the sound card - Even though my passive one does! My active bass doesn't work with any of my other appliances either that my passive one does, like my tape player/hi-fi/active speakers etc. Is there a reason for this??