Pin mapping on the backside

Pin Function
1 Jack 1 tip
2 GND
3 Jack 2 tip
4 GND
5 Jack 3 tip
6 GND
7 Jack 4 tip
8 GND
9 Jack 5 tip
10 GND
11 Jack 6 tip
12 GND
13 Jack 7 tip
14 GND
15 Jack 8 tip
16 GND
17 Jack 1 ring
18 GND
19 Jack 2 ring
20 GND
21 Jack 3 ring
22 GND
23 Jack 4 ring
24 GND
25 Jack 5 ring
26 GND
27 Jack 6 ring
28 GND
29 Jack 7 ring
30 GND
31 Jack 8 ring
32 GND