Pin     Function
1       Keypad -- right column
2       Keypad -- middle column
3       Keypad -- left column
4       Start, Pause, and Reset common
5       Keypad -- third row and Reset
6       Keypad -- second row and Pause
7       Keypad -- top row and Start
8       Keypad -- bottom row
9       Pot common
10      Horizontal pot (POT0, 2, 4, 6)
11      Vertical pot (POT1, 3, 5, 7)
12      5 volts DC
13      Bottom side buttons (TRIG0, 1, 2, 3)
14      Top side buttons
15      0 volts -- ground
 
Thanks to Jeff_M_Lodoen@cup.portal.com for the pinout info.