No sound on Plex files through Chromecast

Hello,
I have two Chromecast :
1 Ultra connected through a HDMI Switcher separating audio and video to a 2.0 Speaker, I have no issues.
1 Normal, connected to a PicoPix Projector. I have no sound. The Chromecast said Surround Sound is enabled and Volume Sound can’t be controled. With my PicoPix projector, I canmanage surround Sound. The issue only appears with Plex App and I have no problem with other apps through Chromecast (Netflix, Amazon, …)
I heard it was a problem with AC3 sound, that could be fixed changing parameters of the Chromecast.xml
So what parameters have I to set on multi channel parameters with Plex? What text I have to put on the Chromecast.xml file? Have I to modify the Chromecast.xml file on every updates? Is there a fix coming from Plex dev?
Thank you for the answers.

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