Here is at the build I did … with speaker output or balanced headphone out.
Im planning a new one with the same basic setup but with the following outputs
USB
3.5mm headphone
Balanced Headphone
RCA line level
XLR Balanced Line Level
Im not sure if all of these can operate individually but The USB and other outputs should be able to live with each other playing different streams over LAN I hope.
I also hope to have a volume knob on it to control it when needed.
This is going to use the new IQAudIO DAC PRO HAT and the Pi-AMP+ that matches it.