where I can control the sound/vocal, I feel high sound and low vocal
For Himedia Player theres no option for this (which I highly propose and expect to be implemented in it anyway), you can only "trick" with it when you playing your videos with KODI (instead of the native HM Player): for this you must enable the setting within KODI->System->Audio settings->Normalize levels on downmix (ON). But as far as the normally usage of these media players goes, that's basically not what you (and others having sometimes the same issue, with bearly hearable dialogs in movies) would want.
A patch/fw implementation of this kind or similar (selectable) feature in the core Himedia Player would be appreciated and highly anticipated futhermore... (But seriously doubting the possibility of this kind of particular enhacemant, while we're still on the edge of waiting (for a long time) for the resolve of some basic and mayor fetures, like 3D cadence correction, and correct DVD fps switching...) It would be expeted thet we would complain these days (plenty months and fw updates away from these devices first release) futher from this kind of issues, but obviously seams that we must park our othervise improver suggestons and needs bellow, to wait if even the main -and advertised- features will be fixed and work correctly sometimes...