Logic out of Macbook Pro causing "clipping" sound???

Hello,
I'm very new with using my Macbook Pro to create live music. Currently I'm using an M-Audio MIDI keyboard and want to be able to have our keyboard player use this MIDI keyboard for "pads" while using another piano as "grand piano".
Here's the problem:
I'm using an 1/8 in adpater from my computer---> quarter inch cable---> DI box---> Main System. I'm thinking my issues may lie somewhere in that transition. Out on the house board it's showing hardly no signal strength but yet it has the sound of "clipping" the tweeters. Something is clipping somewhere or going on with the signal that I can't explain. Would it be better for me to get a FireWire/USB2 interface such as an M-Audio and then run the interface out to the main system?
Thanks for your help!!!
nate

Is the macbookpro new? Running OS X 10.6.5?
What version of Logic 7 Express are you running? For Logic Pro 7 you needed 7.1 at least to run on Intel based Macs. Run Software Update.
btw, Logic 7 isn't officially supported on OS 10.6.x. I would recommend upgrading to Logic Express 9.
Also in Logic 7 check that you have core audio enabled. Go to Logic Express > Preferences
Choose Audio and Core Audio MUST be enabled.

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