Keyboard Help (? to toggle)
R: Record
P: Play
S: Stop
Space: Toggle stop/play
<: Rewind to beginning
>: Fast forward to end
B: Skip back 3 seconds
K: Kill from this point on (careful!)
F: Flatten everything to time zero
Z: Undo most recently-made pen stroke
A: Toggle fixed aspect mode for inserting images
F1..F4: Drawing modes (while recording or stopped)
F5..F10: Drawing / editing modes (while stopped only)
0..9: Change to a different pre-set color
