You can control with 8 inputs.
Servo number | GPIO number | Pin in P1 header (the actual position) |
0 | 4 | P1-7 |
1 | 17 | P1-11 |
2 | 18 | P1-12 |
3 | 21/27 | P1-13 |
4 | 22 | P1-15 |
5 | 23 | P1-16 |
6 | 24 | P1-18 |
7 | 25 | P1-22 |
P1-13 is connected to either GPIO-21 or GPIO-27, depending on board revision.