I am wondering how a Lampi DAC, say a Golden Gate III, sounds directly into amps by way of the volume control option. I could add in a pre-amp later, but for now, would run it direct. Is having the volume control in the DAC a plus when I do add in a pre-amp? I would also run a CD transport into the GG III. The outputs on the transport are SP/DIF or AES/EBU. Which is preferred by experience? Thanks!