When I'm on the road trying to process a recording in the hotel room after a show, I can't get anywhere near decent volume from my laptop through my HD280 Pro headphones. Once I increase the volume above about 50% on the laptop's mixer, I get nothing but distortion. To resolve this, do I need to use a USB soundcard in place of the onboard audio and headphone jack, or do I simply need a headphone amplifier to put in between?