Digitech Whammy Modification

Whammy 4




It appears digitech is finally making a new whammy pedal that’s true-bypass, as well as having mono (ie: glitchy) and polyphonic (like the EHX POG) modes. That coupled with the fact that some people have experienced problems with this mod (I never did), I recommend just buying one of the new ones when they come out. 

I’m leaving this page up as it’s still a fun mod to do, and you can do things with the momentary switch that you can’t do with any other whammy.

Here is a demo of what a modified whammy can do (in addition to having crystal clear bypassed tone).


Like everyone else, your whammy starts off like this:

Original Whammy

-Soldering Iron/Solder
-Phillips Head Screwdriver
-7/64″ Allen Key
-Few feet of hook-up cable
-Drill with a unibit, or appropriately sized bits
-3PDT switch of your choice (I used a blue one from Pedal Parts Plus)
-SPST micro momentary switch (part# 275-1571 from Radio Shack)
-2PDT momentary (only if your doing the momentary mod).
-LED/Bezel of your choice
-1k Resistor for the LED
-Adjustable wrench


Removing the allen screws. You’ll need a 7/64″ key, or a plier (if you don’t mind scratching the screws up).

Step 1


Remove the phillips screws holding the MIDI jack in place.

Step 2



Opening it up. Be careful not to force anything during this step as you could damage the pedal.

The enclosure is in two parts, the baseplate, and the faceplate. You want to gently move the faceplate towards the right (the side with the MIDI jack), and it should push back away from the faceplate. Then push the baseplate towards the left (sliding it off the output jacks) and it should come clean off.

Step 3

Here is a video showing you how to open the pedal up:



Remove the momentary switch that serves as the current bypass. We will be moving it to the back of the enclosure (using a smaller switch). Also unsolder the cables leading to it, to make the rest of the modification easier (no momentary switch flopping around everywhere).

Step 4



Put the 3PDT in its place.

Step 5



Cut the output trace. There’s a tiny, thin trace between the two little blobs of solder that you need to cut. Use an X-acto, or utility knife. If you have a Multi-Meter, test for continuity. You can do it without it, but it would be harder to trouble-shoot if not working right.

Step 6



Cut the input trace. This one is easier to cut.

Step 7



Wire it up! Standard true-bypass wiring. To solder to the tiny blobs, I loaded the blobs with some extra solder before trying to solder the wire to it.

Step 8



Powering the LED. Since the WH-4 runs off AC power, we can’t just tap into the power where it comes into the board. After some poking around, I found some 5V DC power where marked on the board. The negative can be taken from a variety of places. I used the one marked on the board. I found a 1k resistor in series with the LED worked perfectly.

Step 9



Wiring Overview


Switch Wiring


STEP 10:

We still nee to be able to access the original momentary switch to calibrate the pedal. Solder the black/white cables to a momentary SPST switch of your choice. I used a Radioshack 275-1571 for mine. You can mount this switch anywhere you want. I mounted mine on the rear of the unit so it’s not visually distracting. I reinforced the soldered joints with duct tape as the black/white cables are rather delicate and felt like they would break if bent too much.

Step 10

Everything mounted and ready to close. Notice the paper, to prevent shorting out with the new, fatter, circuit board area.

Complete Job

To put it back together, follow steps 1-3 in reverse. Here it is all put back together.

Back Together

Side View

Rear View

Mine has the extra 2PDT momentary, for quick stabs. The wiring is identical to the 3PDT, and you just wire them in series (one after the other). Although there is circuit board under the word ‘Whammy’ on the front, there is a small spot where there is enough clearance for a switch.

An added perk of the momentary switch, is when you have the effect engaged via the 3DPT, if you press the momentary switch you get a 50/50 blend of dry/wet in certain settings! So you can get some sounds this way that you can’t get normally.

The instructions on this page serve only as a guide. I take no responsibility if you break your pedal, or hurt yourself. SO BE CAREFUL!!

I found my modded WH-4 sounded excellent. Clean bypassed tone, and no noise or anything. This has been the case for people I have modded the pedal for, and many people who have contacted me after modding the pedal.

There have been a small amount of people that have experienced some slight noise problems after modification. This may be due to their setup, or any of other reasons.

I no longer own a WH-4 after finding a WH-1 (click here for comparison between the two!), so I can’t further test/troubleshoot things other than what I already know.

If you are hesitant to take on the mod yourself, you can contact Molten Voltage as they do this (and many other mods).


  • Thank’s for this great tutorial. I just modded mine, it was really easy although I was swetting in case I break my pedal :D
    It’s really worth the work!

  • On the “Momentary” mod 2PDT switch your diagram, which side of the switch is the normally open side?

    • @JasonG, the top half of it. (So when nothing is pressed it’s going straight from input to output).

      • Of course, thanks!

      • Could you send me a simple diagram of the true bypass mod drawing? and could i just buy parts from Radio shack?

        • The diagram is on this very page (under “Switch Wiring”).

          Unfortunately you can’t do it with Radioshack parts. They don’t seen the 3PDT switch you need to make something (anything) true-bypass.
          You can buy it off ebay as well as tons of other places online.

          • I’m picking up Radio signals thru y amp with this pedal any ideas to solve this issue? Thank you

          • No idea there. Are you using any other pedals at the same time? Distortion/fuzz pedals often pick up radio. Digital pedals don’t normally do that.

          • could you tell me if you know how to do this here is what digitech sent me


            Does the Whammy pick up radio when used alone? If so, it’s usually a proximity issue, and won’t happen in every place the Whammy is used. However, soldering a 330pF capacitor between input and ground inside the Whammy will eliminate radio interference.

            I can’t get a clear answer on where to connect the cap to what pins

          • I don’t have a WH-4 anymore, so I can’t take pictures or anything, but the input and ground will both be right by the input jack underneath.

  • another resource i found for this mod requires a separate output jack to be installed to make this “true” bypass. do you find this to be true?


    • The second jack on that mod is to control presets with a footswitch. Other than that that mod looks identical to this one (though much tidier wiring I must say!)

  • The description of the mod for the WH-4 was clear, concise, and well written. Has one ever been written for the WH-1? Where do I get a schematic of the WH-1?

    The Old Guy

    • Never done one for the WH-1. There’s a couple of people out there that do a mod for it however.

      • Thanks Rodrigo. I will figure it out and provide you with the procedure. Is a schematic available for the WH-1?

  • hi i just got a tc electronics nova modulator and the bypass sounds horrible, i was wondering if you might know of or know some one who offers a true bypass mod for this pedal?

    • Don’t really know. I think all the TC Electronics stuff is true bypass anyways (via relays). I could be wrong about that though.

  • most of their stuff is, at least their stomp boxes but the nova series is not.

  • Hi! Nice MOD I have a question… I need to repair a damage strip from de expression pedal… do you know how to make a new one? Thanks!

    • Thanks!
      No clue there. Best taking it to an electronics repair guy.

  • I nailed it :) Made the strip with my pc now I’m gonna make your mod! :) Thanks!

  • I have a question on how to handle STEP 8. My board (still Whammy 4) doesnt have any solder-blobs on a lot of connection points.

    My Board looks like this:

    Im stuck on Step 8, so I´d really appreciate your help ! Thank you !!!

    (My email should be visible in WP ;) )

    THX !!!!!

    • If there aren’t any blobs there you can put some on it (heat up the point a tiny bit and pop a blob of solder on it). Be careful not to heat it up too long, or put to big a blob.

  • Thank you so much for your quick feedback ! I will try ;)

    • It worked ;) Thanks again for sharing such a wonderful guide !

  • how do you connect the led? i see the plus minus but where do they connect to the 3PDT
    and do you have any idea how to conect a pot for a blend for wet & dry output

    • For a wet/dry blend you need an active circuit added. Molten Voltage does mods like that.

      • i realy fucked it up the bypass works but the whammy dosnt

        • Yikes. Is it powering on and all that? Might need to take it to a repair shop…. The bypass would work even if the pedal is off.

  • this has to do with the led lights i only have 3 working now they started go out a month ago how can i fix them help please

    • No clue. That sounds like a job for an electronics repair guy.

  • Hi Rodrigo, congrats on your updated website, I did the whammy mod about three years ago and it’s still rocking hard, big up!

  • thx for the great tutorial *thumbsup* unfortunately i think i’ve bricked my whammy… the true bypass seems to be a mute switch now – any ideas? did only the 3DPT mod… is the led mod neccessary for powering reasons? ( sry – i’m a noob :) )

    • No it doesn’t need the LED to work. Does the pedal still power on?

      • old switch still works – power works – just the 3DPT switch mutes the signal

        • BTW – thx for the quick response. according to the diagramm there is no “up or down” on the 3DPT switches, isn’t it.

      • now it TBP works :) could you explain the LED wiring? sry for bothering you ^-^

  • Very interested in this mod. Couple of questions for you:

    1) what are you actually soldering the “to effect” and “from effect” wires to on the board? Just those very tiny blobs of solder that you can see on the closeups?

    2) the link to the “standard true bypass wiring” is broken. Where does the wiring from the LED to the switch go (a little hard to see with all the black wires on the screen)?

    And what’s the reason for the new LED? Just because it needs to be wired directly into the switch and the original one will not reach?

    Thanks again. Looking forward to trying this.

    • 1. Yeah the tiny blobs. It can be tricky to solder to them just right.

      2. Use this link:

      The reason for the new LED is that the old one is now ‘always on’ since we want it that way for true-bypassing. The new LED is so you know wether or not the effect is engaged. Not needed, but it’s helpful.

  • So I dug into this today, but I’m having a problem that where I’m supposed to attach the new leads, there’s no solder bubbles there to work from, just empty holes.

    Is my board not capable of this or something?

    See the pic of the output where the cut trace and the attachment should go. Thanks.


    • That’s weird. Just dab solder onto it and it should stick as the ‘holes’ are copper plated either way.

      • Yeah, trying… :)

        Once I get a little bit in there, the iron seems to just suck it back up. I’m afraid I won’t have anything to solder the wires onto once I cut the traces…

        • You can maybe try poking the end of the wire in the hole. Not ideal, but it’s something.

  • OK. Think I’m halfway there…. I got the input and output wired up to the 3PDT, and it will pass the “bypassed” signal with the power off (good sign that the true bypass is working). The problem I’m running into is twofold:

    1) The “calibration” switch still seems to be functioning like an on/off switch (even when wired up to a new Radio Shack SPST momentary switch like shown. When the 3PDT switch is switched “ON”, the SPST momentary switch will still turn the effect “ON/OFF” when toggled. I assume that’s not supposed to happen, right?

    2) When running a fuzz pedal after the Whammy (with the Whammy “bypassed”), it picks up radio signals like crazy (which aren’t picked up when just plugging the guitar right into the fuzz). I haven’t installed the LED yet, is this a problem that the switch is not “Grounded” in some way? Right now the whole middle section of the 3PDT switch is empty. I don’t see anywhere in your diagram where the switch is grounded. Do I need to do that?

    Thanks, I think I’m almost there :)

    • Congrats, it’s quite satisfying to build/mod something like this.

      1) That’s 100% normal. It’s not a “calibration switch”. It’s actually the on/off switch like you always had before. The reason we still need access to it is for calibration. In order to use the button this way you hold it down while plugging the power in, then you sweep the pedal back and forth, in order to calibrate it. So you never actually press it during the course of normal use. It’s only exposed so when you need to calibrate the pedal, you can. In the years I owned the whammy I only calibrated it a handful of times, and nearly all of those were after I took apart and reassembled the pedal.

      2) Fuzz pedals are notorious for being fickle about stuff, and for picking up radio. The switch is grounded through the body of the pedal (which is grounded). It’s probably because the whammy is putting out a buffered output and your fuzz pedal isn’t liking that. Does it still act that way with the fuzz before your pedal? Either way, there’s not much you can do about fuzz and radio noise really.

      • Yeah I got the “cal” switch thing figured out and now it’s working well. The biggest issue was all the problems getting those solder joints down with on the input/output FX where there were empty holes :) This thing’s held together by chewing gum and duct tape… I hope I don’t drop it.

        The radio interference thing is weird though. There’s no interference when using the fuzz on it’s own, there’s no interference when using the whammy on it’s own, only when they’re combined.

        I did some searching and found that it’s a somewhat common problem with TB switching when the input FX is not grounded in the switch wireup when the effect is bypassed (as the diagram you shared above is not). Apparently that open input when bypass can act as a receiver when high gain sources are combined like a fuzz. Instead, I wired it up like like this (which should ground the FX input when bypassed):


        Which seemed to help, but there’s still some interference coming through. I wonder if the ground I have the middle of the switch going to is not a good ground source…

        • Plus, the pedal wouldn’t be putting out a “buffered” output when it’s in bypass mode. That’s why we bypass it in the first place :)

          Yeah, before the bypass mod, if I put the fuzz after the whammy, turning it on would make it shriek uncotrollably and lose the low end (because of the buffered signal). But now (since the buffer is bypassed with the whammy off) the tone of the fuzz is as normal as it should be, there’s just an undercurrent of radio interference if you’re not playing anything or decaying a note for too long.

          I’d still like to get that figured out and think I’m still not grounding the bypassed input FX lead somehow.

          • Hi josh
            Did you ever get to the bottom of the interference in when bipassed
            Mine is doing the same thing

        • You can always reenforce the joints with some hot-glue. It won’t improve the solder joint at all but it will help the mechanical stability a touch.

          Yeah there’s a ‘ground everything’ way to wire stuff up. It normally isn’t an issue and the diagram I put up is easier to understand, when looking at it, so for DIY purposes I’ve gone with that wiring for this guide.

          You can try electronically (as opposed to mechanically through the enclosure) grounding the switch(es) but then you run the risk of having a ground loop, which can also be problematic with noise/fuzz/etc…

          So in short, not really sure what the best course of action is. It doesn’t hurt to try grounding things and seeing what’s up after that.

          • How would you suggest better electronic grounding? I’d really like to get that noise out if here.

          • Not necessarily better but you can physically run a wire from the ground on your switches to the ground on the circuit board, but that may cause ground loop problems.

    • i’m having the same problem. the spst switch acts as an on off but the 3pdt when activated makes insane feedback noises when the whammy is shifted up or down. when stepping on the momentary switch, it makes the whammy go into true bypass… so its like the 3pdt is acting like the momentary and the momentary acts as the 3pdt… i followed the diagram precisely though so i’m not sure what is going wrong..

      • All of that is normal. The old momentary switch you don’t ever touch, unless you want to calibrate the pedal.

        The momentary and 3PDT are wired up the same, so you don’t need to use them at the same time. If you want the effect on permanently, turn on the 3PDT, if you want it on only for a second, then use the momentary. If you have both on, you are creating a feedback loop, BUT, if you set it up an octave up setting and play, you get a cool sounding “dry + 2octave up” kind of sound (like in my demo video towards the end).

        But all of that your experiencing is normal. You just have to learn to use the new switches/functionality.

  • OK… thought we had it all figured out, but it’s all gone up in smoke :)

    I finally plugged it back into my board tonight after getting everything back together, and while it certainly is now “true bypass” (doesn’t badly buffer the signal in front of it, passes signal when it’s not powered) the clean signal coming out is much quieter, and more veiled, then when I just bypass the pedal entirely (like the most severe form of “tone suck” that you would try to prevent with a mod like this).

    I have no idea what went wrong as everything is functioning as it’s supposed to (no problem with signal routing or noise or issues), but the signal through it is much quieter it just sounds awful.

    If I turn the pedal on and use the “dry out” jack, it sounds great clean, just the right volume and tone as if the pedal wasn’t plugged in at all. But the “clean/pedal off” tone using the “wet” output sounds awful.

    Obviously not blaming anything on you or the theory behind this mod, just trying to think of what I possibly could have done to cause this issue and how I can correct it.

    Bad switch? Bad wiring? Any ideas?

    Any guidance would be great. Thanks again for you help through the process.

    • Not sure. I don’t have a WH-4 anymore to do further testing/tweaking on, but I know that the Molten Voltage mod is more thorough that mine (although more expensive). Might be worth getting in touch with them to see about having them do their mod.

    • Well the plot is thickening a little bit…

      If I run an “octave up” effect and leave the footpedal all the way down (so it’s just passing that normal “clean” signal before shifting the octave, that tone is much like what the tone should be. It’s much louder and cleaner. As soon as I “bypass” it via the 3PDT switch, the tone and volume just dive. It’s as if when in bypass the signal just isn’t cleanly getting from in to out.

      Does that indicate that it could be the switch that’s got a problem?

      • That’s always a possibility. Did you heat the switch up alot? Those 3PDT switches aren’t the sturdiest/stablest things and don’t enjoy heat much.

        • Well I don’t even think it’s that anymore. I just ran a straight wire from the “input” lead on the input jack (identified on your drawing) to the “out” lead on the output jack (identified on your drawing), bypassing the switch altogether, and it still has that “tone suck”.

          I unplug the cables and put them in any other true bypass pedal and the tone and volume are right back where they should be (so it’s not a psychological thing with a buffered tone or cable length or anything).

          There’s something on the board that’s sucking the tone/volume out when i have it running through the jacks and the PCB board (even when taking a lead right from the positive terminal of those input/output jacks). I don’t know if something got damaged during the soldering and it’s doing some small voltage divider somewhere and part of the signal isn’t making it all the way through, but it ain’t gettin’ there :)

          I’m just using normal old bell wire (that I’ve used in TB mods before without issue) so I don’t think it’s that.

          • Well it seems I found the problem… I’ll email you.

          • Hey!

            I know this is an old thread, but i just modded an old WH-4 using this site. (Great instructions by the way!)

            I am having this same signal loss problem, what did you do to fix it?

          • I think there’s an issue where there’s still ground connected on the other side of the board. I was always happy with the sound of mine and never experienced funny business, and have since moved onto a WH-1, so can’t really confirm one way or another. Hope that helps!

  • Hi Rodrigo

    Thank you for that great tutorial and mod! I did it today and it works fine.

    Just a few questions (some are yet in discussion):

    1) I had also the felling of getting a bit loss of volume…so maybe Josh Wheeler had already found a reason for that?

    2) 3pdt set ON and pressing momentary switch accidently together. With this case, it’s possible to let sound engineers freaking out, when generating accidently a double hell of insane feedback :). Maybe you did something against it? Maybe a 5V relay wired with the LED which “close” the connection to the momentary switch when LED is lightning (3pdt aktivated)? Better way to solve this?

    3) some tiny and high (electronic) noise when distortion pedals are ON in the chain: What would you do to solve it? Maybe isolate the new wires in the whammy, maybe something else?

    greetings and thanks again for the mod!!


    • 1- I think there might be some wiring things that I need to work out. It may not be fully true-bypass. I don’t have a WH-4 anymore (I bought a WH-1 a few years ago) to test with though, and there appears to be a new whammy coming out soon (true-bypass with monophonic(wh1) or polyphonic(ehx pog) modes).

      2- That’s working ‘correctly’. Basically that causes a feedback loop. If you use this on octave setting (+1/+2, -1/-2) and play at the same time, it makes for an interesting sound.

      3- Not sure there. I never experienced any noise/volume issues with my setup, but some people have reported that it doesn’t play nice with high gain pedals. (may be related to point 1)

      • Hi Rodrigo,
        thank you for your quick reply! It was fun to mod the whammy…good learning exercise (not to easy) for a beginner in circuit bending/modding.

        greets from schaffhausen, switzerland

  • Hi Rodrigo
    Finished up the mod
    All the functions do the switching and pedal working properly
    However, getting a good buzz in both effect and bipass
    Sounds like a grounding issue as it runs through the guitar as well
    The buzz gets louder when then you contact the strings on the guitar
    Also affected when touching the casings on the cord ends.
    Does running the + voltage for the led through the switch have any chance of causing this?
    Any insight or suggestions would be greatly appreciated.

    • Shouldn’t be getting ground buzz anywhere. Might be a wiring issue either in the pedal (check your wiring points) or perhaps in your guitar? (Try it with a different guitar?)

      • I was able to determine that the buzz was caused by a bad power source to the amp which was causing a grounding issue with the entire system
        Once I got things plugged into groundeds power source the buzz is all but gone
        I still have a minor noise issue. Here’s what is happening
        When the effect is engaged the signal path is a bit noisier than prior to the mod
        Is this to be expected. This is a concern because I run my whammy first and do not want that noise transfers to my other pedals
        When In bypass I am getting a lot of noise, sounds like a ossilating RF signal
        This is with the pedal running independently , not running into or from any other effect.
        Not happening with anything else in my rig
        Any idea what this may be or what the fix is

  • I rewired the switch using the same layout that josh posted above
    It cleared up the buzz and most of the noise
    There is still a noticeable amount of high frequency noise when in bipass only
    What is the detail on adding a capacitor to take this out

    • I did some posting on DIY stomp boxes and got some great input.
      I used shielded George L cable from the input jack to the switch, the diagonal jumper on the switch, and from the switch to the output jack,
      That did the trick, no more interference bleading into the signal
      Tha is for you help on this

  • Hi, Rodrigo & Guy’s! I’ve spent much time with this mod & managed really hum less bypass with the help of shielded wires, but new problem – when I touch the pedal – hum goes in spite of the fact that my multimeter showes short net between jack ground & housing.

  • I was wondering if you can help me out… i’m trying to repair a busted switch in an old WH1… the old one was no use, so I ordered a spare from a guy from ebay in germany and a couple of days ago it arrived… I wen’t on an disasembled my WH1 and replaced de switch succesfully (following the same path as the old switch) or so I thought… now when i play i can only get two sounds, a fifth above an a third above, and none of the other switch positions seems to do anything… my cuestion really is if you have/know the wiring for this particular model, or know where i can get it, I can not find anywhere online… the switch in cuestion has 6 terminals but in the circuit there are only 5 that seem to be conected… thanks in advance, and great mod BTW

    • That sounds like a job for a proper electronic repair guy. It also seems that the switch you bought is either not working right, or the wrong kind.

  • Thanks for keeping this page up! I just did TB and LED, and it works great! Not bad for a first-timer. The only thing I noticed is a slight increase in volume when turning the whammy ON, I guess it can be an advantage too.

  • Hi all. I had a go at this to do the simple true bypass mod as my original button busted i figured why not. Things are not going so smooth for me. The first thing that went wrong was the little solder blob on the input side completly lifted out and solder would not re-attach…after some fussing i finally got some to set back down, though i’m not sure if it’s making contact with the trace that’s on the underside of the board (under the input jack) which leads to “l4″…i’m not getting any reading with the dmm…can some one please tell me what, if any, reading you’re getting on the input side small blob. I’m getting a true bypass signal but not effect. The pedal powers on and i can hear it going through all of the settings but no effect signal makes it through. Any help is greatly appreciated. I wouldn’t mind seeing other photos of the wiring some of you other guys did…if anyone is kind enough my email is imyourinterest@aol.com …did you guys follow rodrico’s switch wiring exactly or did you follow the “true bypass” link?

    • A couple of people have mentioned similar things (the blog coming off, or not being there at all). I suspect later WH-4s got skimpy with the solder explaining that. Sadly I don’t have a WH-4 anymore (I scored a WH-1 a couple years ago) so I can’t take any readings/pictures. Best of luck.

  • People that do this MOD, please….DO NOT GO WITH THE WIRES on the OTHERSIDE of the chip!

    You will pickup noise from it!! I see 3 mods online that make the same mistake.

    Rodrigo you did that too, along with others.

    This is how it should look ;)


    • Hi RSZ, I’ve done the wiring as you suggest and I have no more problems with high frequency in bypass mode. But now when I engage the pedal there a click. I’ve tried to sold a 1.5 Mohm resistor between input and ground and output and ground but it’s the same. You can hear the click only when you engage the pedal, no when you switch to bypass. Any suggestion?

      • It’s been a while since I own this pedal (I now own a modded WH-1), but from what I remember there was a bit of a click (like most true-bypassed pedals).

  • Rodrigo how can i know if the 3PDT switch is upside down (knowing that the connections should be horizontal), or it does not have a side ???

    • The connections should be ‘wide’. As long as it’s that way it doesn’t matter which end is ‘up’ as both are the same.

  • Rzs,great comment! I’ll try to remove ground screen that was helpful in digital noice reduction & use your approach.

    Christopher, I noticed is a slight increase in volume when turning the whammy ON too. may be it’s posible to use tmim pot in output amp? let’s try to take it’s schematic!

    please e-mail me sashurkin@ukr.net

  • […] viene explicado paso por paso en esta estupenda web, incluso con una modificación que incluye un segundo pulsador momentáneo, pero en […]

  • Hi I have a a problem with the expression pedal on my whammy 4, it doesnt stay where I leave him, im trying to used the mode of harmony but in the back possition never works, it never goes fully back, what can I do??


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Rodrigo Constanzo
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