Novena has an audio codec that has two outputs: Output 1 and Output 2. There is a set of files available to map these in Pulseaudio. The repo is available on github.
To build, you will need to install git-buildpackage. Then, check out the code and build it using git-buildpackage:
git clone https://github.com/xobs/pulseaudio-novena cd pulseaudio-novena git-buildpackage -us -uc --git-upstream-tag=v1.0