Magnifi Max + external Chromecast volume issue

So I bought the Magnifi Max yesterday and it is absolutely amazing. But, I'm having an issue with my Chromecast which I've plugged in to HDMI 3. When I switch off the soundbar and turn it back and Cast something, it's at max volume - the setting doesn't seem to stay as with the other devices on HDMI 1 & 2. Any suggestions?

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