SBC=Single Board Computer, the VIMs and Edge are SBCs.
Both the Edge and the VIMs have SPDIF output available on their GPIOs. Neither needs the Tone Board to output SPDIF.
Note: Only VIMs can be connected to the Tone Board by GPIO. For Edge, the Tone Board can only be connected by USB.
If the Tone Board is mounted to the VIM(as your sandwich shows), SPDIF output signal will be passed from the VIM’s GPIO through the Tone Board’s SPDIF connector.
The Tone Board itself does not produce an SPDIF signal.
For either Edge or VIM to get SPDIF output, Android Settings/Sound, it needs to be set to SPDIF.
I was unable to get this working on the VIM2, it worked on older firmware.
Edge-V’s GPIO.
SPDIF pins highlighted in yellow in this picture…
