symphonic-mpd v1.0.x is 64bit (aarch64).
roonbridge seems to provide a 64-bit binary under the name armv8.
Install it by the following command.
curl -O http://download.roonlabs.com/builds/roonbridge-installer-linuxarmv8.sh
chmod +x roonbridge-installer-linuxarmv8.sh
To use the symphonic-mpd driver for Xenomai, you will need to write your PCM to /dev/xsink.
There are many ways to configure the driver for Xenomai, but the same method as for Spotify Connect is useful.
That is, specify
default as the device for alsa.
( see /etc/spotifyd.conf )
hw:0,0 is specified as the alsa device, then the driver for Xenomai will be set to It will not be used and will be played using the normal ALSA library/ALSA driver.