This is one where I agree with OCD Mikey the HiFi Guy. If you only have one source and your DAC has volume control then why have a Pre Amp other than if you have multiple sources, as I do.All a pre amp is, is a expensive (in some cases) volume control.
I am not real keen on using my Innuoos Sense Application as the volume control through my DAC. I know Jerry @carlsbad2 is using the Chord Dave that technically is a pre-amp and agree his use will have less coloration than say Quicksilver Pre Amp. I respect Jerry and he is one of the smartest people on this forum.