Use keys 1,3,4,6,7,9 to skip back/forth in recordings

1 = Skip back 30 secs. 3 = Skip forward 30 secs.
4 = Skip back 90 secs. 6 = Skip forward 90 secs.
7 = Skip back 240 secs. 9 = Skip forward 240 secs.
Intention: To provide a quick way to skip commercials etc.