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Rated 5.0 out of 5 stars
1 Review
Regular price $189.00 USD
Regular price Sale price $189.00 USD
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What started out seeking the warm overdrive of the 808 but precision tone shaping of the ST9 to create anything from tight modern metal to fat blues grit resulted in the GRIM overdrive. Mix the versatile range of tone shaping controls with additional headroom from the internal charge pump and it's off to riff city.

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Date Version Description
2023-11-26 3.1 slight modification to overall level for more output
fixed TS mid control is now a trim pot with default where it was set before
very subtle gain revision
newer higher quality opamps (goodbye TL072)
2024-01-25 3.2 changed the internal charge pump from bipolar 9v to bipolar 15v for improved headroom
This is the last change I see for GRIM for a long time, this thing is dialed!



Name Location Description
Impedance Internal (trim) The variable impedance buffer is set to 1M by default and won't matter for players using active pickups or buffered pedals in front. There is a significant impact for single coil pickups. Decreasing impedance and loading the down the pickups will attenuate the top end and smooth out the high-end grit. Pushing the impedance (default) the top end and pickup attack are more defined.
Default: 1M
Level External More on tap than the stock 808. This is your standard volume attenuator that allows you to set from unity or below unity, or crank it up for a boosted signal.
Tight External Pre-gain high pass to tighten up the low end.
LPF Internal (trim) Smooth out the high end of the gain output.
Default: 9/10, Almost fully CW.
Low External Cut/boost the bass frequencies.
High External Cut/boost the high frequencies.
Blend External Mix between 100% buffered dry signal and 100% wet signal
Full CCW for buffered dry.
Clean Boost Internal (trim) Adjust from unity buffer to clean boost on the 100% dry side of the Blend.
Default: 3/4 CW
Mid Internal (trim) Adjust the amount of mid hump. This is the classic Tone control and it alters the tone before going into the 2 band EQ.
Default: 8/10 CW
Bite External The mid boost control contours the frequency peak from low mids (counterclockwise) to high mids (clockwise).
Start at noon.
Gain External More on tap than the stock 808. This works in conjunction with the toggle switch.
Clip Internal [DIP] Allows for symmetrical LED (high gain punch, compressed)[on,off], Diode Lift / None (clean boost) [off,off] or asymmetrical silicon (dynamic) [off,on] clipping options
Default: Left up (LED), Right down
Bypass LED Brightness Internal Adjust overall brightness of front LED.
Default setting at minimum (full CCW).


This product contains internal circuitry to increase the 9VDC supply to higher voltages for additional headroom.
This product contains THE overvoltage circuit for 9v input only.





Soft click (1.1KGf) mechanical 3PDT.


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    Free USPS Priorty Mail shipping in the continental USA.

    International shipping rates calculated at check out.

    Please note international shipping times can be days to weeks. Unfortunately, this is out of my control.

  • Built To Order

    Unless otherwise noted, all builds are built to order. I build on my nights and weekends so build-time can vary but is typically 7-9 days from order. Excluding preorders. For preorders, see preorder details on product page for estimated shipping.

Rated 5.0 out of 5 stars
Based on 1 review
Total 5 star reviews: 1 Total 4 star reviews: 0 Total 3 star reviews: 0 Total 2 star reviews: 0 Total 1 star reviews: 0
100%would recommend this product
1 review
  • BJ
    Brian J.
    I recommend this product
    Rated 5 out of 5 stars
    8 months ago
    A Holy Grail for Amps?

    GRIM3 is a ‘sick’ pedal, and in a good way (my demo: Think of GRIM3 as a tone sculptor. Find a base tone, but you want it to sound tighter, more aggressive, greater definition, etc., of what you hear in your head. The EQ is basic, with subtle bass & treble controls that help to hone in on a sound after setting the other controls. BITE controls frequency contour from low mids to high mids, increasing note attack. TIGHT controls pre-gain high pass to tame the low end. Combine these two and it's a chugger’s paradise for a modern-metal tone.

    BLEND controls how much buffered dry signal is in the mix, versus 100% wet signal (which has more saturation and the nature/quality of the GAIN becomes more noticeable). GAIN ranges from low to moderate, which means you can get very good rock tones when cranked from a clean amp, but certainly works wonders when turned low and combined with a very dirty or hi-gain amp. BLEND is to taste... a more robust sound with more headroom or a more saturated & compressed sound.

    GRIM3 is one of those always-on pedals. Cleans sparkle & sound vibrant, whereas dirty tones sound more aggressive & full-bodied. I keep the Gain relatively low while adjusting the BLEND to taste. And this is where the BITE and TIGHT come in, as they hone in on the sparkle and punch brilliantly.

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