Ok, assuming left to right is 1-6.

When Up is pressed:
1-2 Open
1-3 Open
1-4 Open
1-5 Open
1-6 Shorts
2-3 Shorts
4-5 Shorts

When Down is pressed:
1-6 Shorts
2-5 Shorts
3-4 Shorts

Nothing Pressed
1-6 Shorts
2-4 Shorts
2-5 Shorts
4-5 Shorts

Ok all you electricians, What does it all mean?