Endorphin.es Autopilot is a tuner module for modular synthesizers in Eurorack format. The module has two tuners that tune the oscillators very precisely to the note "A". Simply connect the module's drop-out jack to the VCO's 1V/Oct input and connect any waveform output to the voice module's reference input (tune-in). If a keyboard or sequencer is connected to the keyboard input of the module and the tuner button is pressed, the oscillators tune to"A". The reference tone can be shifted from 440 Hz to 432 Hz by pressing the tuner button longer.