The Endorphin.es Autopilot Silver is a tuner module for modular synthesizers in Eurorack format. It features two independent tuners that allow precise tuning of oscillators to the note "A". To use, connect the module's "Drop Out" jack to the 1V/Oct input of your VCO and route any waveform output to the module's "Tune In" reference input. When a keyboard or sequencer is connected to the "Key" input and the Tuner button is pressed, the oscillator automatically tunes to "A". Holding the Tuner button allows you to shift the reference pitch from 440 Hz to 432 Hz.