The 75% volume thing is a known bug and it was said that it will be fixed for the official release of the paid version.
The notification on the taskbar is intentional.
I dislike it too though and already suggested to remove it.
You can completely remove it (even including the icon which I want to keep) by going to start menu -> settings -> system -> notifications & actions. At the bottom you find Bongiovi DPS and turn it off.