Keeley Electronics Dark Side Fuzz/Mod

by Keeley Electronics

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  • Keeley Electronics Dark Side Fuzz/Mod

    You can behold the universe in a glass of wine.

    We should all be so lucky as to be identified by the sound of a single note.  Some players are so well defined that their entire musical journey can be heard in a single note they play.  Tone is in the fingers.  Tone is in the mind.  Effects can be a great way of expressing emotions or creating textures.  The Dark Side is about creating sounds and adding new tones to your symphony.  It’s the things you can’t create with your fingers or mind.  It’s metasymphonic.  The Dark Side provides all the textures that define an essence, in one pedal.


    The individual pieces that make up the Dark Side workstation are Fuzz, Delay and Modulation.  The Fuzz side of the Dark Side is a big fuzz style distortion based on a 1977 op-amp style.  We used something similar in our Psi Fuzz.  This one is completely and radically different.  We made what seemed like endless changes to extract the nuances of earlier transistor based fuzzes.   We gained it way to down to fit the time period and the style.  This is a more transparent Big Fuzz.  This one lets your guitar sing with sustain, yet retains the essence of you guitar whether single coil or humbucker based.

    The next core element in the Dark Side pedal is the Delay and Modulation side.  You can select between a multi-head tape delay effect or between a combination of 4 different modulation sounds.  The Dark Side delay has 12 different syncopated delays.  They are rhythmic and have the tonal quality of the old spinning drum tape delays.  The Dark Side has many subtle filters to get the tape delay setting to have the feel and warmth of the original machines, yet gives you range of control to have modern features like expression pedal control for the number of repeats.  You can use it for creating a feedback oscillation delay.  Extremely subtle modulations in the delay make it very musical.

    The next atom in this workstation is the modulation effect.  There are four parts to this effect.  Flanger, Rotary Speaker Cabinet, U-Vibe, and Phaser.  You can blend between the “Electric Lady” Flanger and a Les-Rotary cabinet, creating new sounds.  You can find that perfect blend between a vintage sounding opto-coupler based U-Vibe and the little orange phaser.

    There is a TRS Insert for adding effects in between the Fuzz and Modulation/Delay side of the pedal.  This is handy if you have phaser or chorus pedal you might want to add if you want to use the Delay side of the Dark Side.  That way you can have Fuzz>Phaser>Delay for example.  There is also an Expression Pedal port on the pedal.  It is highly recommended to have an expression pedal handy.  You can make many adjustments on the fly that just increase the fun and functionality of the pedal while you’re creating music.  It has to be a TRS style expression pedal.  We suggest something like the M-Audio or Moog expression pedals.



    At the heart of the Dark Side is a hand built board that contains analog fuzz and a high quality 24-bit DSP engine. We studied and analyzed decades worth of gear and crafted our own sounds that give you not only the original tones, but an endless range of in-between sounds you can’t get elsewhere.  Even if you have other Keeley effects or workstations, you don’t have these exact sounds.  The Rotary is slightly different than the Monterey, it’s more chorus like.  The Flanger is different than the hidden one on the Bubble Tron. The U-Vibe on this pedal is also deeper and throbs with more intensity.  If you were lucky enough to get one of the Jimi Hazel Phase Delays or put the Bubble Tron into the hidden bank 2 mode; well then you have heard our 4 stage phaser.  It’s dead on and a blast to play.  Like the Monterey, this unit is completely hand built.  Including the high-end DSP, everything is hand assembled and soldered by our technicians with decades of experience.  Attention to detail and tone at every point.


    What you get is a Mother Lode of effects and sounds.  Necessity is the Mother of Invention.  Someone needed to put all these epic sounds in one box.  So we did.  There’s no need to wish you were here, get out your Strat and we’ll see you on the Dark Side.


    Please visit this site. I can’t say what a joy and bundle of knowledge these people have presented.  It truly is a wonder. Without the plethora of information at Gilmourish, this pedal would not have been possible.

    Keeley Electronics Dark Side Fuzz/Mod Features:

    • We want you to feel confident with your Prymaxe purchase, which is why when you purchase a new or demo (like new/gently used) product from us, you are automatically enrolled into our FREE Two Year Warranty.* 


      What is covered:

      • Brand new (non-clearance) and demo (like new, gently used) products that have been purchased within the last two years
      • Products that malfunction under normal use
      • Cost of repairs


      What is NOT covered:

      • Used (non-demo), vintage, and clearance products
      • Products purchased more than two years ago
      • Cost of shipping both ways
      • Items with clear signs of abuse (up to Prymaxe’s discretion)


      * We reserve the right to end this promotion at any time.


    • When you place an order at Prymaxe, you can rest assured that your item will be carefully packaged. Our shipping team is dedicated to making sure your item arrives in perfect condition and on time.

      All in stock orders placed before 2pm EST will ship same day and all orders placed after the cutoff will ship the next business day*. If you need an order immediately, please let us know and we’ll try our best to accommodate your request.

      * Our same day shipping policy may be temporarily suspended during a sale or if you pay with Affirm. Rest assured, we will do everything we can to get your order out as quickly as possible. Please call us at 1-855-PRYMAXE if you are placing an overnight order and need it to go out immediately.


      Domestic Shipping
      Most orders shipping within the US will ship via USPS or FedEx and are fully insured, we also offer express options if you need an item within 24 hours. All tracking numbers will be sent via email after the item is shipped. If you did not receive your tracking number please feel free to call or email us. 

      All US Orders Ship for FREE

      International Shipping
      We love and truly appreciate all of our International customers. All of our international shipments are fully insured and are guaranteed to be delivered or your money back. We offer a variety of shipping options for you to choose from and if for any reason there is an issue with your order we will make it right, that is our promise you. 

      Pre-Order Shipping: 

      Pre-Orders typically ship with 2 weeks. In the event a product is backordered we will contact you with an exact shipping timeframe. 

      Smaller items will ship USPS First Class. 

      USA shipping only for Vox, Korg, Voodoo Lab, MXR, Dunlop, Way Huge, Barber Electronics, Music Man, Tech 21, Fender, Marshall, PreSonus, Source Audio, and Strymon.

    • If you would like to return an item, please use the return widget at the bottom of this page to look up your order and start the return process. If you need assistance, or if the widget is not working for you, please email us at with our order number and reason for return.

      45-Day Satisfaction Guarantee

      If you are not 100% satisfied with your purchase, you can return it within 45 days of the original purchase date for a full refund. If an item is not received by us within the 45-day window, the package will be refused. All new items returned must be in BRAND NEW condition with zero signs of wear or use and must be returned in the original packaging with ALL materials (free/bundled items -- must be unused/unopened, warranty cards, plastic, pouches, manuals etc.). Demo (Like New/Gently Used) items must come back in the same condition they were sent to you, with all included materials, if applicable.

      Our 45-Day Satisfaction Guarantee covers brand new and demo (like new/gently used) products only -- it does not cover used and clearance products (see below). It also does not cover items in the “What is NOT Returnable” list below. Please note: All actual shipping fees paid by Prymaxe will be deducted from your refund. This includes orders that qualified for free or subsidized shipping. Return shipping must be paid by the buyer. If you received a defective or incorrect item, please see our FAQ section below.  


      * Prymaxe reserves the right to define abuse of the return policy on a case by case basis and consequently refuse subsequent return requests by said abuser and place them "All Sales Final".


      Used and Vintage: 

      All Used and Vintage items come with a 48 hour approval period. Please contact us directly at within 48 hours of receiving your product for us to set up a manual return for you. Be sure to include your order number and reason for return in the email. All Used/Vintage items must be returned in the same condition they were sent to you in, as well as include all materials that came with it.

      What is NOT Returnable:

      • Accessories (this includes all pickups, strings, picks, pedalboards, tuners, expression/volume pedals, etc.)
        • However, if you received accessories with the product as part of a bundle, the accessories must be returned with the product, and they must be unused and unopened
      • Clearance Items (Clearance items are clearly marked with "CLEARANCE" in the title)
      • Special/Custom Orders

      Return Instructions:

      All returns should be insured by the buyer and sent via UPS, Fedex, or USPS with tracking. Please do not write on or attach tape or labels to the product box -- use a packing box to return the product. Attach a shipping label with the RA number onto the shipping box.



      When will I get my refund?

      Once your return is received by us, your refund will typically be processed within three business days. It typically takes a few business days for all credit card refunds to be processed and reflected on your statement. This means it will take a few extra days for your refund to show in your account after your return is processed. Please note: All actual shipping fees paid by Prymaxe will be deducted from your refund. This includes orders that qualified for free or subsidized shipping. Return shipping must be paid by the buyer. If you received a defective or incorrect item, please see the next question.  

      What if I receive a defective or incorrect item?

      If a product is defective upon arrival, or the wrong item was received, we will send you a replacement/the correct item, and all the shipping fees will be covered by us. For defective items, Prymaxe reserves the right to refuse the return if we determine the reason for the unit failing was not covered under the warranty (i.e., if the item was damaged due to user fault or error). If you feel your item was damaged in shipping, please take plenty of pictures of the damaged box and item and immediately contact us so we can open a claim with the shipping company.

      Please be very diligent with testing your defective item. Be sure to try other guitars, power supplies, cables, and amps. We also request that you take a video of the item not working. If we receive your item, test it, and find it to be working, we will give you a refund minus the cost of shipping both ways.

      When will I get my replacement item?

      If a defective or incorrect item was sent to you, we will send out the replacement as soon as we get the defective/incorrect item back and approve/process the return (typically within three business days). If we do not have the replacement in stock, we will issue a full refund. If you need the replacement to be sent out immediately, please place a new order, and when we get the defective/incorrect item back, we will issue a full refund of the original order.

      When must I ship my return?

      Your return must be received by us within 45 days of the original purchase date. This means you must ship your return with enough time for us to receive the package within 45 day deadline. If it does not arrive within 45 days, we will refuse the package. If you feel you sent the package within a reasonable time frame, but it arrived late due to the shipping company’s error, please immediately contact us to make an appeal before we refuse the package.

      What if I pre-ordered an item?

      Even if you pre-ordered an item, we must still receive it within 45 days of your order date in order to give you a refund, so please only pre-order items you plan to keep. If your pre-ordered item arrives defective, you will have a 48 hour period to contact us for a replacement.

      Why was my package refused?

      There are a number of reasons your package could be refused by us, including:

      • It was a new/demo item received outside of the 45-day window
      • It was a clearance, accessory, or other non-returnable item
      • The package is missing items that were included in the original shipment
      • The item shows signs of wear
      • The original product box was damaged or written on/the item was not packaged in a separate shipping box

      Why is the widget not letting me return my item?

      If you have a valid reason for returning/exchanging a product that is within our return policy, but the widget will not let you start the return process, please contact us directly at with your order number and reason for return.

      Returns Widget

      Use the widget below to look up your order.

      If your order is not found, please make sure you added the number sign (#) in front of it.

      If your order is still not found, please email us at with your order number and reason for returning so we can create a manual return for you.