Finally finding the time to circle around to this. Seems the issue is the audio out reverts to HDMI after a reboot of the PI. My temporary workaround is to have my ISY send this command every couple hours to change it back to analog:
{"jsonrpc":"2.0","id":1,"method":"Settings.SetSettingValue", "params":{"setting":"audiooutput.audiodevice","value":"PI:Analogue"}}
There must be start up file somewhere to force this thing to stay with analog.
I'll try the beta if that's my only option but thought I would ask.