Mac version volume controls

Hello, I play Pokemon Insurgence on a Mac and while the in game sound track is nice, it does get repetitive. On a PC you can manually adjust application volume in the toolbar, but on a Mac you cant. So it would be much appreciated if the devs would implement a volume control in game for the Mac version so i can listen to my music while playing the game. I know i could use my phone to play music and mute my computer, but the option of adjusting the volume would be much appreciated.

Thank you!