User Manual
Jet Fuzz – Based on* the Roland
®
 Jet Phaser
Yeah, yeah. We know. The phasers belong in our MM4 Modulation Modeler – but with this little fella, we just couldn’t resist. It’s 
the AP-7 Jet Phaser. A Roland
®
 catalog from the ’70s says it best: “...the Jet Phaser/AP-7 is a phase shifter producing dynamic 
jet sounds for rock guitar.” One listen to the fuzzy swoosh of this model is all it takes to remind you of Ernie Isley’s Who’s That 
Lady, and Uli Roth’s work with the Scorpions. Take a close look at the small text labeling the BASS and TREBLE knobs of 
your DM4. These knobs have special functions for use with this model: BASS controls feedback and TREBLE sets the rate of 
the phaser. The trusty MID knob gives you tone control over the fuzz part of the effect. The noise gate function does not work 
with Jett Fuzz.
Fuzz Pi – Based on* the Electro-Harmonix
®
 Big Muff
®
 Pi
Not to be outdone by the Brits, the colonies came up with their own twist on the fuzz rage. Mike Mathews had been cooking up 
all sorts of nifty effects when their attention turned to the distortion/fuzz pedal. Their most popular offering was the Big Muff
®
Pi, known more for its sweet sustain than for its buzz. Electro-Harmonix
®
 was famous for their use of surplus parts, and the results 
of this practice were ever-changing circuit designs and parts specs. As you can see in the picture of our collection, the Big Muff 
had several looks, but the sweetheart of the bunch is the one in the middle, known as the “triangle knob pattern” model. MID  
functions like the original tone control. Set BASS and TREBLE to 12 o’clock for the classic sound.
Jumbo Fuzz – Based on* the Vox
®
 Tone Bender
Have you noticed how the British music scene of the ’60s not only gave us great bands, but also inspired a bunch of cool gear, 
too? Thus is the case with Tone Bender. To measure it’s success, all you had to do was track down Jimmy Page. Once you found 
him, if you looked carefully you’d find a Tone Bender close-by. The classic Tone Bender signature can be heard all over the 
first two Led Zeppelin records, and is especially apparent on “Communication Breakdown.” Set BASS, MID, TREBLE to 12 
o’clock for the classic sound.
Facial Fuzz – Based on* the Arbiter
®
 Fuzz Face
Sometime in late 1966, this infamous circular stompbox hit the London music scene. Designed and built by Arbiter Music, the 
Fuzz Face would soon begin its famous association with guitar legend Jimi Hendrix. Like all stompboxes from the early era, the 
Fuzz Face would see many design changes, as well as re-issues. Our model is based on the germanium-powered era as pictured 
here: An original, very early “gray with black screening” Arbiter Fuzz Face. This legend is now yours, thanks to the DM4’s faith-
ful recreation of its fuzz and glory. Set BASS, MID, TREBLE to 12 o’clock for the classic sound.   
* All product names used in this manual are trademarks of their respective owners, which are in no way associated or affiliated with Line 6. These trademarks of other manufacturers are used solely to identify the products of those manufacturers 
whose tones and sounds were studied during Line 6’s sound model development. Roland® is a registered trademarks of Roland Corp. Arbiter® is a registered trademark of Arbiter Group PLC. Vox® is a registered trademark of Vox R&D Limited.  
Electro-Harmonix® and Big Muff Pi® are registered trademarks of New Sensor Corp.







