The MXR M225 Custom Shop Sub Machine is a righteous octave-fuzz pedal packed with sounds from the storied past of the '60s and modern high-gain sub tones. Essentially a combination of a bypassable classic octave-down pedal and MXR's La Machine fuzz, the Sub Machine offers up sensitive, well-laid out controls in a bulletproof enclosure -- perfect for both grinding guitar leads and blown-up bass guitar sounds with a healthy dose of sub-synth funk.