Line 6 FM4

Line 6 FM4

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FM4, Wah-Wah/Auto Wah/Filter for Guitar from Line 6 in the Stompboxes Modeler series.

6 user reviews

Line 6 FM4 tech. sheet

  • Manufacturer: Line 6
  • Model: FM4
  • Series: Stompboxes Modeler
  • Category: Wah-Wah/Auto Wahs/Filters for Guitar
  • Added in our database on: 11/23/2004

We have no technical specifications for this product
but your help will be much welcomed


Line 6 FM4 user reviews

Average Score:4.4( 4.4/5 based on 6 reviews )
 3 reviews50 %
 2 reviews33 %
 1 user review17 %
Value For Money :
heads on fire11/01/2011

heads on fire's review"Wacky guitar fun!"

Line 6 FM4
16 Digital Effects
20 Factory Presets
4 User Programmable Channels
Controls - Effect Selector, Freq, Q, Speed, Mode, Mix
Additional Controls - EX-1 Expression Pedal (optional)
Mono/ Stereo - Stereo in/ Stereo out
Durable Metal Chassis Color - Purple
Dimensions - Length: 10-inches/25.4 cm; Width/Depth: 6-inches/15.24 cm; Height: 2.375-inches; Weight: 3.1 lbs

Available Models:
• Tron Down
• Tron Up
• Seeker
• Obi-Wah
Voice Box
• V-Tron
• Throbber
• Spin Cycle
• Comet Trails
• Slow Filter
• Octisynth
• Synth-O-Matic
• Attack Synth
• Synth String
• Growler
• Q Filter


The pedal, like the other 4-stomp series pedals from Line 6, is incredibly easy to dial in good (crazy) sounds, while being simple to save patches and recall stored settings. The manual is clear, concise, and with a good dose of humor! The housing seems to be incredibly durable, although the switches...not so much. I haven't had problems with them, but I've read numerous reports of people that have. The knobs provide a good, positive full throw from full on to full off.


I'm rating this a 10 for what it is. Anyone that wants crazy old-school synth sounds or filter sweeps from the guitar should look heavily into this box. It does all the crazy bleeps, bloops, swoops, sweeps, warbles, and just general thick Moog and Oberheim-style synthesizer sounds. I feel that the sounds have really inspired me to come up with some neat, creative parts that I would not have thought of otherwise, and they provide solid hours and hours of enjoyment.


I'm giving this a 9 overall. It's a solid entry from Line 6 into the wacky world of analog synth sounds for guitar. Other pedals have done it, but I'm not so sure any other pedal that does this sort of thing has done it with so much variability, versatility, and general patch sound recall as this pedal has. The brilliant purple coating is a fun touch. One thing - the pedal is much larger than a standard pedal, and heavier, so it adds bulk to a pedalboard setup. This is something to consider, definitely, but the overall vibe of the pedal is pure joy. Highly recommended.

moosers's review

Line 6 FM4
The Line 6 FM is a stomp box that has a variety of filter effects on it including wah-wah and synth type sounds. I believe it is a digital pedal and it has 1/4 inch inputs and outputs and also has an input for an expression pedal, which comes in handy for using the wah effects. It is not rackable as it is a stomp box.


The configuration of the FM4 is pretty easy to get used to - there are 16 different effects and 5 parameters that do different things for each of the different effects. It also has four foot switches where you can preset your own sounds. The manual is very useful as it explains what each of the parameters does for each of the different effects. It also has information about how to concoct some really cool tones and is overall really useful.


The sound quality of the FM4 varies from effect to effect. The main reason that some of the effects aren't all that great is because of the tracking. It doesn't pick up the guitar as well as I would have like and will make some strange noises on some of the effects. Some of the better effects are the octi-synth, the seeker, and attack synth. While a bunch of the other ones are pretty good to, for the type of music I play most of them are not realistic enough for my taste.


I've been using the Line 6 FM4 for about three or four years. I was intrigued by it for the longest time and finally decided to pick one up. While there are a number of pretty good effects on this, for the type of music I play, which is mostly acoustic folk and rock, they are not realistic. However, I can definitley see why a lot of people like this pedal for its interesting sounds and versatile nature. It isn't overpriced for the amount of effects you are getting and is built like an ox. While I'm glad to have it around for that special occasion if I need it, it probably isn't useful enough for me to keep around much longer.

prodilion's review (This content has been automatically translated from French)

Line 6 FM4
View PDF on the site with photos of the legends pedals mules.
On paper it's euphoria!


After 10 years of practice, we must be able to rprer without the doc.


The +: large sound.
the -: not playable trs and cold.


I tried the FM4 store and I t's. While extraordinary sounds from outer space but carrment unusable. The rglages trs are sensitive, and the buttons have diffrent meanings depending on context so it's anything but intuitive.

In addition, it not sound hot trs I find when I'm not at all what criticizes the POD (the same manufacturer). For cons, I fell for the Bass Micro Synthesizer Electro-Harmonix (see opinion). You have a low and you would like a moog on scne? Ben sailing.

The FM4 is probably in the studio, the o was time to take the head.
It pedals so mule filter that I think it does not have much competition today, unless we limit an effect based filtering (eg Electro-harmonix).
Although 'this time, would see the multi-effect perhaps?

sexybrocoli's review (This content has been automatically translated from French)

Line 6 FM4
The pedals offer filters and synth (real, not just a succession of filters (such as micro synth EH), it is a true synthesis is based on an old system me who has a proven and DTECT the pitch and height at which applies that synth ... a simple principle, but only allows mono.) 4 memory, which is good but no top. MODEL is the pedals (the MODEL rack offers MIDI and more, but I'll bat). It's a tank, it weighs a PSE, the TRS footswitch is solid (of the kind of cry baby), the potentiomtre inspire confidence ...


It takes time to master the bte. It's enjoyable to find new sounds, there are too many! (Making it difficult to configure chih) The manual is clear trs, it explains what had inspired MODELS ingnieurs Line6 with photos of ... The leaflet explains what the good rev ... CONTRL


Filters are in Nikel and trs Fidler original MODELS! This is the ultimate wah, configurable with a desire and its really clean (long live the numrique)! (No spit like a cry baby) The MuTron is the pellet. The slow gear trs hovering ...
The synth is fonky trs (Moog. ..) The sound palette is available impresionante. It sometimes spray when adcroche and adchire!
The PDAL has all the qualities of numrique (sound really clean) and those from analog (sound warm and groovy).


Must have 2 years and it always surprises me (it's a really exotic pedals)! I bought the pedals of expression and offers many possibilities (you can control any function with the pedals !!!). In my humble opinion, this ruins the whole concurence pedals (Boss (Designed for bass, too expensive for what it is, does not offer much of his), Digitech (wah all rotten, too some of its available) and EH (often too expensive as this brand does not offer as many possibilities as the FM-4). qualitprix The report is good plutt seen all there is in effect the pedals and the quality gnrale. prfre is my pedals!

Prodilion PS: This is full of wealth and pedals it takes time to tour all the possibilities it offers. You think it sounds "cool"?? Sounds sounds trs their Fidler MODELS (MuTron, Moog ...), and you can not say whether synth effects or "cold" ... Just because we play the guitar for ten years we can read a notice Apparently, I have rarely seen a record both shows and rdige ...

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Line 6 FM4 videos

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