Erica Synths Black Output is a high-quality output mixer and a stereo panner with balanced outputs and headphone amplifier for monitoring your modular masterpieces. All inputs are buffered, we use stereo potentiometers (similar to those used in high quality studio mixers) for panning, IN4 is a stereo input with simultaneous level adjustment for both channels, IN3 has a CV controlled auto-pan function. There is also a 6.3mm jack for the balanced outputs and headphones.