Currently, zooming affects both the x and y axes at once. It's more useful to have these independently zoomable, though (like most DAWs).
I would also suggest binding this mouse/keyboard shortcut: Ctrl + Scroll Wheel. When the mouse is hovered over the piano view on the left, it would affect the y-axis zoom. When hovering over the midi-note view, it would affect the x-axis zoom. This is also standard behavior AFAIK.
Currently, zooming affects both the x and y axes at once. It's more useful to have these independently zoomable, though (like most DAWs).
I would also suggest binding this mouse/keyboard shortcut:
Ctrl + Scroll Wheel. When the mouse is hovered over the piano view on the left, it would affect the y-axis zoom. When hovering over the midi-note view, it would affect the x-axis zoom. This is also standard behavior AFAIK.