MXR Sub Machine Octave Fuzzchat_bubble_outlineFrom real comments

The sub-octave mode is the standout feature for most players. Commenters repeatedly single out the sub-octave setting as remarkably bass-like, with one saying it sounded like an actual bass guitar being played. Another noted the pedal brings out thump and bass that other fuzzes lack, calling it versatile enough to use with different amps. One user even suggested running it through a subwoofer-equipped amp to fully appreciate its low-end power, since it doesn't get demoed with one often.

Many compare it directly to the MXR Blue Box and Slash Octave Fuzz. Several commenters see the Sub Machine as a modern take on the Blue Box, noting it now offers both octave-up and octave-down instead of just two octaves down. Others feel it's extremely similar to the Slash Fuzz, just missing a blend control and wrapped in purple. One person outright called it a 'rebranded' Slash pedal, showing some confusion about how distinct the two products really are.

Not everyone found it easy to use, and treble management is key. One long-time owner admitted buying and selling the pedal three times, never quite getting it to sound good with their amps despite finding it cool. Another warned that the Sub Machine needs the treble knobs on pedal, guitar, and amp all kept low, since it can produce a lot of raspy treble otherwise. A separate comment described its tone in a demo as simply 'too screamy.'