First off, there's a difference between 'noise' and 'hum'. If it's a hum, that's a ground loop between the board and the converter card. If it's a 'noise', then:
Level mismatch between the board's output and the soundcard's input. See if you can get some info on the soundcard and what the matchup is supposed to be. Also try turning the board's level down and see if it clears up any. If that helps, a simple passive attenuator could just work. Or:
May just be a noisy soundcard. Try an inexpensive(2 channels in and 2 out) AD/DA audio interface, with either an IEEE(PC) or Firewire(Mac) bus to your computer. A USB2 bus connection is also fine in lieu of Firewire or IEEE. M-Audio makes some good, inexpensive units that'll give you some measure of level matching and better quality AD conversion. I'll also give you the option of recording as 'midi' instead of 'audio' if you choose to go that route. HEY, your music's worth it!
Best, Paul
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WUDAYAKNOW.. For the first time in my life, I'm wrong again!!
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