Mike, as far as I know, I can usb feed the Aurender into both the MCD1100 and C2500. Additionally, I do have the D100 on standby too.
Yes and yes Bud. No problems. In the app, you turn off the display. As for PCM to DSD and back and forth and back and forth - no problem. Works flawlessly. All my playlists are a complete mix. Seamless.