I'll step you through the way I did it.  This worked for me but feel free to do something different if you see a better way.  I use NHRC-4's.  The 
controller shouldn't make any difference.  Just make sure that the de-emphasis in the controller is strapped out.
 
 To make sure we are on the same page I am using a 19A129924G2 or G3 board  G2 is rem/rep & G3 is remote only.  Either one will work.
 
 Remove the Jumper from H1 to H2 see note 1.  I assume you have a Channel Guard filter board plugged into J4 & J3.  Remove R16, make sure H13 & H12 are NOT jumped (this is the normal repeat audio path).  Take your audio out to the controller from D14 RX Notch filter output.
 
 If you are using a rem/rep board remove Q13 just to make sure you don't have two repeat audio paths.  I also removed Q5 to prevent unwanted switching.
 
 On the TX side feed your controller output in A9. Remove the jumper from H7 
to H8.  Use the Remote PTT line in the station to key the repeater.  This will 
turn on Q21 remote audio switch.  This will give compression on the TX side, just don't go overboard with it.
 
 I mounted my controller on a GE prototype card & plugged it in J1212 (second from the left) of the control shelf.  I had to make a jumper card for J1209 to bring RX & TX audio to J1212.  I cut off an unused card that had the pins needed.
 
 Follow the pin numbers on a back plane schematic & it'll become clear.
 
 I did this because I was using the de-emphasis in the controller & a friend said it didn't have the "GE sound".  After rewiring as above he said, "now 
that's it".
 
 Pictures of one of the repeaters are posted on GE-MastrII under Mastr II NHRC4 interface.
 
 J-1 Primary Radio Port
 ("REPEATER")  
 PinUse                            MASTR II BACKPLANE
 1 +13.8 Volts                      J1212 D1
 2 CAS (active high)                J1212 A13 RX MUTE
 3 PTT (active low)                 J1212 D3 REMOTE PTT
 4 Receiver Audio                   J1212 D11 RX AUDIO
 5 Transmitter Audio                J1212 D10 TX AUDIO
 6 Fan/Dig IO (active low)          J1212 A7 GC Monitor
 7 Ground/Audio Return
 8 Ground/Audio Return              J1212 D8
 6 Fan Control if used              J1212 A10 to TB1201 15
 
 2.      J-2 Secondary Radio Port
 ("RB")  
 PinUse
 1 CAS (active high)                J1212 C7  to J1214-1
 2 PTT (active low)                 J1212 C9  to J1214-2
 3 CTCSS detect (active high)       J1212 C6  to J1214-3
 4 Receiver Audio                   J1212 C8  to J1214-4
 5 Transmitter Audio                J1212 C10 to J1214-5
 6 Ground/Audio Return              J1212 C5  to J1214-6
 
   
   
                              
 PinJUMPER BOARD
 1 J1209 D11 to D14 RX AUDIO
 2 J1209 A9 to D10 TX AUDIO
 3 J1209 A10 to D4 FAN CON If used