Is the Suptronics x400 amp and DAC HAT supported in Pi MusicBox? http://www.suptronics.com/xseries/x400.html
According to the specifications and support documentation from the manufacturer, should just work with IQAudio Dac settings, and seems to in Volumio for instance. However, Pi MusicBox doesn’t seem to recognize the HAT and keeps rebooting. Bit of a puzzle.