Thank you - I I have a Grand Concerto model NV-I8GM and, after some failed attempts to get this Nuvo integration setup manually as a custom component, came across your HACS install. I am running Home Assistant on an Odroid box and It worked beautifully first time. In addition to control by the cards I have tried some basic automation via Node Red and can now mute the Nuvo when the doorbell goes (a Shelly relay).
There is life yet in the old Nuvo system. Control via HA and the media player is much better than using the Music Port app. I have switched to Volumio as my main music source plus a Nuvo DAB tuner.