via the Grove Audio Blog
http://www.groveaudio.com
"After a couple of attempts to build a joystick controller that offered good user accessibility, I think I have got a design that permits one hand operation from either the right or left. My goal was to allow the user to move the joystick and have the ability to trigger the gate buttons with the same hand.
This module includes a reference voltage source that is normalled into the X and Y inputs so that if no plug is inserted the stick position will vary between 0 and the reference voltage or from - reference to + reference. A preset value can be set for each access that varies the center point voltage and an input attenuator will allow scaling an input voltage that is then varied by the stick position. The gate buttons produce a 0 - 5 V gate signal on their respective gate output jacks."
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