@daksider
Egreat Player, VidonXBMC, XBMC, Kodi until v17, are base on PCM passthrough hack for Android.
This hack for passthrough is required Android volume to be set to 100% to void get audio noise.
Egreat Player and VidonXBMC set Android to 100% when Passthrough is Auto/ON and connected audio system support passthrough.
If you still don't understand why Android volume must be set to 100% search "kodi shitty build" on google, install Kodi shitty build on player, set audio passthrough, set AVR/TV volume to small level not to get some damage. play a video, then change Android volume.
If your audio system not support passthrough or what to test it set Passthrough OFF and Android volume will be preserved.