Hi, thanks for all of this first of all.Interfaces for MA1 correction: Komplete 6 MKII, E2X2 OTG
DDC with volume control: PO100 2024
Then connect everything via SPDIF.
To add a physical volume knob to the PO100, you can purchase a generic USB volume knob.
This will send volume up/down commands to your PC, which will forward them as UAC2 Hardware volume commands to the PO100, which finally applies digital signal attention on its Xmos chip.
What do you mean with forward them as UAC2 to the PO100? Will it override the system audio & output level be decided by the PO100? Or do you mean that we can control the system audio with the USB volume knob?