Donny,
Here's how I might start when I analyze a problem like this. Of course, the first thing to check is that the app is setup to run stereo ins( in your case Acid Pro ? ). I'm not certain how Acid works, but I have to believe it's similar to most other soft DAW apps, in that you go to preferences or something similar and check the status of you audio ins, to ensure that stereo in is enabled. For instance, in Sonar I can run either stereo or mono input directly from the audio preferences menu.
If that isn't the problem, I might take a stereo voice from the KB, and pan it all the way from one side to the other while watching the input vu meters on the recording app. I don't know if you have anything in between.. I have a mixer with Vu meters, but you could pan via midi in the kb. The mixer is nice to ensure that the problem isn't on the kb ( or cable ) end.
The other real easy ( but definitely dumb and not necessarily recommended) AJ method is to disconnect the cable from the kb... I'm assuming its a pair of 1/4 inch standard outputs coverted to an 1/8 inch stereo plug that goes into the computer, and touch the hot end ( tip ) of each 1/4 inch plug to my finger while watching the VU meters and listening to the speakers.. I recommend don't do THIS with headphones on and the audio input all the way up.... unless maybe you have a problem because you're hearing is currently so sensitive that you never sleep due to the fact that your that you hear a pin drop in your sleep and it wakes you up... because doing it with headphones on would likely cure that, especially if you have an open ground somewhere.
The last thing I would suggest, after you work out the problem.. is if you're going to do anything that approaches serious audio recording at all, even for demos, forget the built in PC card and go get yerself a dedicated soundcard. Even with one of the lower end ones ( 200 USd and less in a lot of cases ) you'll notice quite a difference in sound quality, and you can scrap that 1/8 stereo input cable and use something better suited for audio work.
Regards,
AJ
[This message has been edited by Bluezplayer (edited 09-20-2007).]
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AJ