KMA Audio Machines is a guitar-effects maker. The current GPAS selection includes Logan Overdrive, KMA Machines Mandrake Octo-Shrieker Octave and Queequeg 2 Sub Generator Octave and covers overdrive pedals, octave pedals, noise gate pedals and distortion pedals. The model name matters because each effect has a different job in a rig.

For these products, compare effect function, control range, switching, bypass or routing, power requirements and the intended guitar or bass role. The product page is the authority for exact circuitry, connections, condition and included items.