I have a mx400 also and am having the same problem with my Force feedback pro. The 400mx card uses the ESS Canyon 3D chip, you can get win 2k drivers from the Ess website (www.esst.com). It's listed under the ES1978. BUT... I did this and it didn't help. I removed the MX400 and reinstalled the onboard sound system and the joystick worked fine (sound sucked, hehe). I've also looked at the MS site, nothing and here, nothing. So, I'm at a loss. Someone needs to put out some drivers or something, I suspect Ess since Diamond no longer makes cards and has no incentive to provide meaningfull support. I hope this helps a little, email me if you get the solution.
