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          NEA Aftertouch Sensor Installation Instructions 
                                 
Thank you for purchasing our aftertouch sensor.  We think that you will find it to be superior 

to the original in terms of expressiveness and feel.  Please follow these installation 

instructions to ensure the best performance from this sensor.  Have fun! 

 

 




                                                                           

                                    Fig 1. NEA Aftertouch Sensor 

                                                    

Pictured in figure 1 is an NEA aftertouch sensor and an additional sensor for longer 

keyboards.  If you are installing two sensors in a synthesizer such as the ARP Quadra, the two 

sensors should be wired in parallel.  This means that you need to twist together the red and 

black wires of the two touch sensors.  
       Before installing the sensor bar, make sure that your key bushings have been replaced 

in the last 10 years.  If they are dried and cracked, the aftertouch will not be smooth or even 

across the keyboard.  The metal tongues that the key bushings mount on should all be straight 

and aligned to the same height across the keyboard.  You do not want some keys to be higher 

or lower than neighboring keys.  

 

 

 

 




                                                                         

                                     Fig. 2 Key:in rest position 
                                                                                   

                                Fig. 3 Depressed key (Aftertouch not engaged.) 

                                                        

We recommend removing the plastic key tops when doing this installation, as it makes 

accessing the metal tabs inside of the keys easier.  

       It is important to understand a little theory on how this sensor works.  Figure 2 shows a 

cross sectional diagram of a Pratt Read keyboard mechanism.  In this diagram, the touch 

sensor bar is mounted beneath the keyboard frame.  The bar can just as easily be mounted 

above the keyboard frame.  To do this, attach the jnuts to the bar, and not the keyboard 

frame.  We recommend mounting the bars as shown in figure 2.  Figure 3 shows the key 

mechanism with a key depressed.  It is important to note that when a key is depressed at a 

normal playing velocity (aftertouch not engaged), the key should be blocked from touching the 

felt of the sensor bar by the rubber key bushing.  The key sheath should not begin contacting 

the felt of the sensor bar until you begin compressing the rubber bushing by pressing down.   

Cardboard spacers are used to adjust the height of the bar across the keyboard so that the 
geometry is as described above.  If a note is too sensitive, adjust the height of the key by 

moving the tab that the bushing mounts to in the upward direction.  This will cause the bushing 

to block the key before it hits the felt.  If a note is not sensitive enough, adjust the tab 

downward so that the key makes more contact with the sensor when aftertouch is engaged. 

The best way to test the uniformity across the keyboard is with an ohmmeter.  Connect the 

Ohm meter to the red and black wires and depress each key to get a reading.  The resistance 

should be very high until aftertouch is engaged.  Adjust every key using the techniques 

described above.  When satisfied with the response.  Reinstall keyboard in to synthesizer and 

wire sensor appropriately. 




                                                                                                 

                            Fig. 4 Sensors installed in an ARP Quadra keyboard 
                                               

       When installing on synthesizers that did not have a touch sensor previously, it may be 

required that you drill additional holes on the underside of the synthesizer to accommodate 

any new screws that must be added for stabilization purposes.  We usually use a tapping drill 

bit that will thread new holes onto the sensor bar from beneath the keyboard.   

Good luck with your installation and enjoy your new sensor! 

NEA 

www.NewEnglandAnalog.com 

2077032350 

 

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