You can zoom the file using the standard techniques cmd and (+) for zooming out, cmd and (-) for zooming in; or on the mouse pad pinch with two fingers to zoom in or out.
Use the right and left arrow keys to move the position of the play-head by 1/1000th increments of the length of the audio / video document.
Use the up and down arrow keys + cmd to move the position of the play-head by 1/20th increments of the length of the audio / video document.
Click cmd + the left arrow key to play the audio / video backwards.
Click cmd + the right arrow key to play the audio / video at double speed.
|Small Step Forward||Right arrow key|
|Large Step Forward||cnd + down arrow key|
|Large Step Back||cnd + up arrow key|
|PlaybackRate Up||cmd + right arrow key|
|Play backwards||cmd + left arrow key|
|Zoom out||cmd + (+)|
|Zoom out||cmd + (-)|