Use External DAC for monitoring with Carbon?

[EricRobinson]

I really love the Carbon and it sounds fantastic, but the center section is missing a few key features that I REALLY miss in my Crane Song Avocet, like Mono, Phase, and having a separate Dim and Mute (right now I have Dim set to -50 dB, so it is essentially a Mute). I also just like the sound of the Crane Song DAC that I have used for almost 20 years, so hoping I can keep the Avocet in my workflow. Has anyone successfully been able to use an external DAC with Carbon? I've tried doing the requisite setup in Hardware, I/O Setup, etc and not having any luck. Has anyone been able to do this?