Good day!
Thank you for your kind suggestions, thanks to which I've been able to add improvements to the app.
Key Features
Windows Key + Scroll - Adjust volume
Scroll on Taskbar - Adjust volume as seen below
Scroll on any Taskbar App - Adjust volume for app as seen below
Additional Features
These features can be enabled in the settings.
Scroll on JustScroll Icon - Change playback device.
Mouse Side Buttons on Taskbar - Change playing audio track.