B on     RR2 off    RR3 off    RT4 on
RT1 off
RR1 off  RR2 pause
         RR2 pause
         RR2 pause
         RR2 pause
         RR2 on     RR3 pause
                    RR3 pause
                    RR3 pause
                    RR3 on
B off    RR2 pause             RT4 off
RT1 on   RR2 pause
RR1 on   RR2 pause
         RR2 locked(on, unpow)

----

B on
RT1 off
RR1 off  RR2 pause
         RR2 pause
         RR2 pause
         RR2 pause
         RR2 off    RR3 pause
                    RR3 pause
                    RR3 pause
                    RR3 off
B off    RR2 pause             RT4 on
RT1 on   RR2 pause
RR1 on   RR2 pause
         RR2 locked(off, pow)