Noise through MBP Headphone Jack

When I boost the gain through an outboard audio interface (Digidesign 003), the headphone jack seems to be outputting a bit of noise. The noise changes as the MBP is processes (sounds like the noise fluctuates with the hard drive movement).
Is this normal?

innergalactic wrote:
When I boost the gain through an outboard audio interface (Digidesign 003), the headphone jack seems to be outputting a bit of noise. The noise changes as the MBP is processes (sounds like the noise fluctuates with the hard drive movement).
Is this normal?
I'm curious - 'boost the gain' - do you mean the input gain on one of the mic preamps? 'headphone jack' - do you mean the headphone jack on the Mac?
Do you have a reason to use the Mac's headphone jack while using the Digi 003?

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