NEA NewEnglandAnalogAftertouchSensorInstallationInstructions (1) free download

File name NewEnglandAnalogAftertouchSensorInstallationInstructions (1).pdf

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 sensit