Boss VO-1 Vocoder, tested but never used, with the original box and manual. It's a discontinued pedal that lets your guitar or bass talk and sing, using Boss's guitar-synth technology. Vintage mode gives classic electronic synth voice, Advanced mode is clearer and more modern, and Choir mode makes lush vocal pads straight from your instrument without a mic. The effects loop and Blend knob let you mix it with other pedals and your dry tone.