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StewMac Swell Drive Pedal Kit

StewMac Swell Drive Pedal Kit

StewMac Swell Drive Pedal Kit With Bare Enclosure

With Bare Enclosure

Item # 2355
Due 1-3 days
Email when in stock


StewMac Swell Drive Pedal Kit With White Enclosure

With White Enclosure

Item # 2355-W
Due 1-3 days
Email when in stock


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StewMac Swell Drive Pedal Kit

About This Item

Get your hands on this ultra-rare pedal
We found a small stash of the out-of-production chips to resurrect the coveted BOSS Slow Gear. Now you can build your own version of this unique pedal.

Only available from 1979-1982, the Slow Gear is an awesome and quirky effect. The variable auto swell sounds like a violin bow or even reverse delay. The components for this pedal were always in short supply, and it disappeared from stores nearly as quickly as it arrived.

Don't buy your next pedal—build it!
The Slow Gear is considered to be one of the rarest BOSS pedals—clean examples sell for 3-4 times the original price! We love this fun circuit so much we tracked down the scarce chips to make this limited pedal kit. Now for less than the original price, you can build it!

Get them before they're gone! These chips are still very hard to find, so when our stock is gone, this pedal will disappear again.

It's more than just a schematic
We include everything you need to build your new pedal:

  • Top quality components from resistors to switch
  • Road-worthy rugged metal enclosure with all holes pre-drilled
  • Bare or powder coated white finish
  • 3PDT breakout board for low noise
  • Input, output, and power jacks rear mounted for easy cable routing
  • True bypass switch
  • Custom printed labels
  • Easy! Download your instructions
    We've made these instructions ready to download now. You can zoom in on every solder joint and resistor value to make sure your build is perfect from start to finish. With these step-by-step instructions, full color illustrations, and complete wiring guide you'll build a pedal you'll enjoy for a lifetime. Be proud every time you step on the custom pedal that you built.

    Make your pedal your way
    It's never been easier to have an inspiring sounding and looking pedal. We include labels for all of the knobs for a professional look. Paint your own raw metal enclosure or choose a powder coated enclosure that is ready to put on your board now.

    Take the first step to customize your sound.

    WARNING: Cancer and Reproductive Harm -



    Product Instructions

    StewMac Pedal Kit Instructions

    Download the assembly guide and wiring diagrams.

    Customer Reviews

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    • 5.00 average rating from 1 reviews

    Easy to build, works perfectly


    Verified Buyer

    Following the step to step instructions, this was a really easy build. Mostly the pictures alone suffice.
    There are a few small issues though. In some places, the illustrations don't perfectly correspond with the text but with some thought and inspection of the writing and marking on the parts, pcb, this is easy to figure out.
    Also on the resistors the rings are hard to read sometimes as red and brown and sometimes black and blue look nearly identical so this takes some guessing and comparing to other parts. The marking for one of the pots on the pcb is also wrong but since the other one is correct it's obvious. Finally, if you buy the white case, you'll need to remove the paint from the holes for the jack sockets as they would be too tight otherwise.
    Having finished the project in two days - putting all the parts on the pcb on the first and soldering and assembling on the second (not the whole days, just a few hours each) the pedal works pefectly and is fun. Perfect little Corona project.

    Response from StewMac

    Hi Sam,

    Thank you for sharing your honest feedback with us, we genuinely appreciate that. You have raised some excellent points. We are working quickly to make changes in the instructions that you noted in this review. Also, we recommend in the instructions to use a multimeter to find the values of any resistors that are too small to read the color bands on. Thanks again for the excellent feedback!