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Line 6 FM4 Filter Modeler Guitar Effects Pedal

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The Line 6 FM4 Filter Modeler Pedal is a studio-quality, professional effects pedal with 16 models of vintage and monophonic synth effects.

The Mu-tron Bi-Phase; the Korg X911 Guitar Synth-... Read More

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    Pro Coverage Eligible Pro Coverage will repair or replace your gear quickly and get you back playing, gigging and recording as fast as possible-even accidental damage from drops or spills is covered.
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    Easy Returns If you're not happy with your purchase, we give you 30 days to return it for a full refund or exchange.

The Line 6 FM4 Filter Modeler Pedal is a studio-quality, professional effects pedal with 16 models of vintage and monophonic synth effects.

The Mu-tron Bi-Phase; the Korg X911 Guitar Synth-are these rebel fighter ships from The Empire Strikes Back? Or maybe proton thrusters from outtakes of Babylon 5? Nope. These, and the other 13 techy tone temptations loaded into Line 6's galactic-purple FM4 Filter Modeler stompbox, represent the outer limits of guitar filter effects, a territory many consider to be today's most fertile terrain for discovering new sounds, timbres and tone colors.

In looking forward, Line 6 first looked back to the filters, vocoders, and guitar synths that players from Frank Zappa and Ernie Isley to Robert Fripp and Peter Frampton have made synonymous with creative guitar playing. "The Throbber" will have your tone gurgling with synth-approved LFO from four wave shapes, including square or triangle waves; "Tron Up/Tron Down" literally drips with auto-wah style response in either Low-, Band- or High-Pass varieties; "Synth-O-Matic" simulates the notably nasty filter sections and wave shapes of prized vintage synths from the Prophet 600 to the legendary Arp Explorer.

Of course, you already use a filter effect all the time; every Wah-Wah pedal is a variable filter, and the FM4 includes a superb "Q Filter" that allows you find and fix that golden frequency notch, in the same spirit as "parked wah" practitioners like Queen's Brian May and soul superstar Prince. Want to make it a more traditional wah? Just hook up the optional EX-1 expression pedal, and save a "Q Filter" sound to both a low frequency (heel down on the EX-1) and a high frequency (toe down on the EX-1) and you've got a more versatile wah than any off-the-shelf pedal, not to mention a pristine 24-bit signal path, stereo ins and outs, and true bypass switching.

Like all Line 6 stompbox Modelers, the FM4 boasts a simple and sturdy front panel design, with four footswitches for saving and recalling your sounds, and six knobs for selecting models and tweaking parameters, with distinct assignments for each knob depending on the model you've chosen. The Line 6 FM4 is for the true explorer of new sonic galaxies; expect to be surprised, stimulated and encouraged to absolute synth-fulness.

Available Models:
Tron DownTron UpSeekerObi-WahVoice BoxV-TronThrobberSpin CycleComet TrailsSlow FilterOctisynthSynth-O-MaticAttack SynthSynth StringGrowlerQ Filter
* All product names used in this web page 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.

  • 16 models of vintage and monophonic synth effects
  • 20 factory presets
  • 4 user-programmable channels
  • Effect Selector, Freq, Q, Speed, Mode, Mix controls
  • Stereo in/out
  • 10"W x 2-1/2"H x 6"D
  • 3 lb.

Pro Coverage gives you added warranty protection for your new gear. Stepping in where the manufacturer's "normal wear and tear" coverage ends, our Pro Coverage program offers you upgraded coverage if your product ever fails Read More.

Pro Coverage includes
  • Accidental damage protection (new gear only)
  • Expedited repair
  • Free shipping (for returns or repairs)
  • 100% coverage for commercial use
  • Extended return period
  • Extended price protection
  • No lemon guarantee
  • Free transfer of coverage to a new owner
  • Repair costs covered for up to three years from date of purchase
  • Repair authorization-toll-free by phone or via the web
  • Customer Reviews


by PowerReviews

(based on 4 reviews)

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Reviewed by 4 customers

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(5 of 13 customers found this review helpful)


Don't buy

By Bagpiper321123

from Denver, CO

I bought this pedal about 8 months ago and it is awful! First off, the sounds are great but it is anything but reliable. Right before a gig it died on me. It literally just died. So I took it and got it repaired. They did pay to fix it but, it took about 6-8 weeks. After that I didn't use it for a while because of the fear of it breaking down right before another gig. But, I took a chance and decided to use it again. Last night it broke again. I pulled it from my pedal board and checked the adapter (get one cause this thing eats batteries like crazy). Adapter was fine so I put battery's in it to see if it was the adapter. No, it was still broken. I left it on the table and after awhile there was a terrible smell. For whatever reason the pedal was SMOKING!!!! If you need a paper weight this is exactly what you are looking for.

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(4 of 6 customers found this review helpful)


So many sounds.... so little sonic space

By Stephen E.

from Clinton, MD

The best bang for the buck. This pedal has so many option that are all controlled so easily. The best feature is definitely the mix knob... you can go all out, or reign it in for just a touch different. It's also built extremely well everything is laid out in logical fashion.

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(8 of 10 customers found this review helpful)


A very tasteful pedal

By Batrash

from Park Ridge, Il

In my experience with guitar effects units such as this, I have found that you are paying for about a hundred different effects that you will never use unless you are buckethead. That is not the case with the Line - 6 FM4. Not all, but the greater majority of the sounds produced from this unit are actually practical in a band setting rather than just something to amuse yourself in you bedroom. It is rather user specific in that it is meant for alternative or indie guitar players; classic rocks shouldn't waste their time with this one. I highly recommend this pedal.

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(27 of 35 customers found this review helpful)


For the musician with everything...

By Metal Falcon

from Sacramento, CA

I thought I had the capability to have my guitar to make any sound possible, then I got the FM4. This thing is amazing. It can really make your style different, as I have not heard may of these effects before. It models the most unique pedals out there. I highly recommend this unit!

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