Zooming in and out using the Z and X keys also works in the MIDI Editor.Pressing the X key in Arrangement view will zoom out to the prior zoomed state, this action is repeatable until Arrangement view is zoomed out to default resolution.Pressing the Z key in Arrangement view will zoom your selection and make it fit to the available screen space.Pressing the W key in the Detail View will horizontally fit the audible range.Pressing the W key in Arrangement View will fit the whole song into view.A MIDI mappable button has been added next to the Arrangement Overview.Pressing the H key in the Detail View will vertically fit the region that has notes.Pressing the H key in Arrangement View will equally distribute your tracks across the available screen height.To use any keyboard shortcuts in Live, the Computer MIDI keyboard must be switched off. Keyboard Shortcuts, Trackpad and Zooming updates in 10.1