I recently set up Volumio on a Raspberry Pi 4.
I hooked it up to my NAD D3045 via USB.
The D3045 wakes from standby whenever the Volumio Pi is connected and powered on. As long as Volumio is physically connected and powered on, even if there’s no music, the D3045 thinks there’s a signal and won’t standby. If I disconnect the Volumio Pi, and only use Optical1 (from my Airport Express), the system goes to standby mode correctly.
This could be a bug or limitation in the NAD D3045, and I’ve opened a ticket with NAD, but I thought I’d run it past you all here.
What do you think? NAD issue? Volumio issue with USB? Let me know! Cheers!