- 2 momentary pushbutton switches 1 rotary switch, 5+ positions 10 LEDs 3 sockets Potentiometers: One potentiometer per step, to set output voltages. (10 One potentiometer for internal clock rate. Arrasta Playbook REP: repique CAX: caixa MSD: mid surdo (sometimes MS1, MS2, etc, if pattern spans measures or has planned variations Mid surdos often vary the sticking by personal preference. Back surdo is.