Kbird, you have type of rotary switch that you can not set, Sokol is right, I thought that you have another one.
So you can use only 10 positions, you can use either 1 ROW and 10 COLs or 1 COL and 10 ROWs, it is up to you. Connect it like 12 switches, it is the same, you need button matrix 1x12 not 2x6 not 4x4... because you have only 1 common pin. If you do not understand it I will post you scheme. Let me know. But in this case the best solution is to use the shift registers because there all switches have only 1 common pin - ground, it is very useful for rotary switch. And you need only 2 arduino I/O pins for connecting all switches (plus VCC, GND and SCK of course), 24 or 64 and so on, max. 96 switches for 1 board with ShRegs. You can mix it, some pins for button matrix and others for ShRegs. PCB is in folder /MMJoy2/PCB/
Bye