i'm doing a t30 install with a port replicator and it looks like i'm going to have to get the usb sound too. the hard disk noise is unbearable.
the noise is there even when i disconnect the power and have the laptop run on it's own batteries, but when i bring it inside and connect the headphone jack on the laptop, no noise! i tried grounding the laptop's chassis directly to the car and that seemed to minimize the hd noise in the video signal, but it didn't do anything for the noise in the speakers. i even tried muting every single source in the mixer panel to no avail. tomorrow i'll try powering the laptop externally (AC) and try playing with some of the amp settings along with trying other sources.
i really don't want to stick another usb device on there.