Unable to maintain or 'lock-in' my audio output preferences

Solution found:

https://askubuntu.com/questions/228619/disable-sound-through-hdmi-permanently

sudo sed -ri 's/^(load-module module-switch-on-.*$)/# \1/' /etc/pulse/default.pa

This stops the system from switching output when a device is plugged in, combined with using Startup Applications to set your default audio on power up - I finally have audio working the way I would expect.

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