Thanks for your help. You say to install the dashboard nodes on each of the 3 EPICs. I installed node-red-dashboard via the Manage Palette, and I can see the new dashboard nodes on the left. I dragged over the audio out node and connected it to my string variable output and all seems to deploy OK. On a networked PC with speakers, in Chrome, I opened up a tab https://192.168.0.130/node-red/ui/ which corresponds to the EPIC that I put the audio out node into the flow. I know from tinkering around that if I add other dashboard nodes (e.g. text, gauge, etc.), and I get a plain looking dashboard. In my case, I dragged over the text node (from the dashboard set) and it correctly displays the string variable, but no audio is being played. I looked into the settings on the audio out node and below are the options:
I see it says “Expects msg.payload to contain a buffer of a wav or mp3 file” which makes me think I have used the wrong audio out node. Can you tell me the settings on your audio out node?