I started recently to create custom panels with Node RED and Dashboard.
Ui-level is very useful to get sort of audio-meters. I'd like the meter to turn greyed with the source is muted. However it seems not possible to control the meter color from an external msg ? Could someone confirm ?
Performance wise such gauge should be created on top of web audio api. It of course can be done using the ui_template node . Never tried but there is plenty of examples you can find world wide. And no, I haven't seen any ready made audio related widget for dashboard.