Herrow to you to :3
Anywho i think i can help by a few quick settings, not too sure if this will fix the buzzing sound :L, when ever i have a buzzing sound its normally the cable's fault(Because of faulty shielding. then i just go and replace the cable.
in format settings for the HDPVR2 set the audio sampling rate to 44.1Khz and set the bit rate to 320kbps if you are using the component cables. Also Try running the HDPVR but not connecting the usb, since the usb is a grounded device, it can generate a noise like your describing.