Moving keys & changing the speed of a selection

When the current selection contains several keys, it is possible to move them all at the same time by moving any key of the selection. Below is an example of moving all the keys of a selection:

Speeding up or slowing down a selection

To speed up or slow down a selection, change the length of the selection by clicking the left button on its right edge and moving the mouse cursor to the left or to the right while keeping the button pressed:

if you decrease the selection length, the events play faster; if you increase the selection length, the events play slower.