press the switch like normal

Use the Primary (4) function control to adjust the volume of the polyphonic harmony

TS-9 - 1982

For those who crave more power

The slots also let you easily hide cables underneath the surface for a neat and tidy setup

MXR M103 Blue Box Octave Fuzz Brand_MXR press the switch like normalMXR M103 Blue Box Octave Fuzz This is the crazy effect heard on Jimmy Page's Fool in the Rain solo. The Blue Box Octave Fuzz takes your guitar signal and duplicates it two octaves down for a huge, subterranean tone. The Blend knob lets you control how much of the fuzz tone is mixed with the two octaves down signal. Not for the timid there is truly nothing like the Blue Box. Fuzzes up your guitar signal, then duplicates it two octaves down Blend