I feel it is the most useful feature on Zorin OS that is to change the volume level by scrolling up and down by keeping the mouse pointer on the volume icon in the panel but it seems like we can only increase up 100% by scrolling up.
But the actual limit is 150%.(We can only go to 150% of volume by sliding the volume bar either in PulseAudio or by clicking the volume icon and not by scrolling up keeping the mouse pointer on volume icon in panel)
So it would be very nice If I am able to increase the volume fully by only scrolling up(150%) and decrease the same.