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Songpony,
your LapTop doesn't have an amplified audio card which is great.
Older laptop use to have those audio chip that were amplified and didn't have a good sound.
When you select the +4 db on your mixer in fact your selecting the balance option. Normally when connect a laptop with any audio card that uses a 1/8" connector or RCA it is a Non-Balance a should be at the -10db.
Your audio chip in your Laptop might need a driver update? Have you download all the latest updates on the Window web site?
Getting a good USB audio card like a SB would be a good option.
regards
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