Dual Joystick Controller

The GMS-952 Dual Joystick Controller contains two X-Y joysticks and gate signal generators in a 2MU panel. Each controller axis has a signal input to apply an external signal that can be modified by the joystick position, input gain control and DC offset controls. When an input signal is not connected, the input recieves a normalized reference voltage which permits the joystick axis to produce a voltage output.

http://www.groveaudio.com/gms952_mu.html