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Server: read the fade-in gain once per channel per frame #6709

Job	Run time
Build vars & Github release (if required)	12s
Build for Android .apk (artifact+codeQL)	23m 51s
Build for Linux .deb amd64 (artifacts+codeQL)	8m 10s
Build for MacOS Legacy (artifacts+CodeQL)	17m 12s
Build for Windows (artifact+codeQL)	26m 25s
Build for MacOS (artifacts)	5m 47s
Create files for .deb repository (if requested)	-1s
	1h 21m 36s