sub-octave

Sources use the term to describe effects ranging from straightforward pitch-shifting, as on the Boss OC-2, a perennial thickening agent for guitarists and bassists, to logic-driven generators like the EHX Octave Multiplexer that track without glitches¹². Sub-octave voices often appear alongside octave-up or fuzz sounds, as on the MXR Slash Octave Fuzz, which combines a main tone with a separate sub-octave voice and octave-up fuzz³. Polyphonic designs like the Electro-Harmonix Nano POG provide sub-octave and octave-up with glitch-free tracking⁴⁵. Monophonic sub-octave fuzzes, such as the Beetronics Babee Whoctahell, glitch on chords and double-stops⁶.