• TalkBass has been independent since 1998. Add your voice.
    Create a free account to reply to discussions, view embedded media, and browse with fewer display ads.
    Join freeLog in
    Want zero display ads or expanded classifieds tools? Compare plans.

fixing a guitar pedal for bass

The Zakk OD is a tubescreamer-based pedal.

You can give it more overall low end by finding the 183 capacitor (18nF, .018uF) and replacing it with something along the lines of 100nF (.1uF) cap.

Clean blend would also work, but I prefer if clean blends can roll off high end so the natural "snap" of the bass doesn't come through over the distortion.
 
You'd need to find a schematic of the pedal, or someone who is good with electronics (if you yourself are not). Then you would need to see if there is a filtering capacitor at the input or output stage, which you would then replace with a more bass friendly value. Additionally, or instead (depending on the circuit), you may also need to change the capacitor value(s) of the tone control (if any) of the pedal to allow more bass to pass through. You could also contact any number of small effects builders, such as [SFX] who is a member here, about modding your pedal for you.

Another way that you could make the effect more bass-friendly is to put it into a blend loop. It essentially mixes your effected signal with the original clean signal coming from your bass, as if you had two bass amp setups with one clean and one effected (okay, it doesn't sound exactly the same... but you get the idea!) There are many pedals that achieve this on the market, including the Xotic X-Blender, Wounded Paw Blender, and the BOSS LS-2 to name a few. Just do a search on here or elsewhere to learn more about them.
 
Try starting with input/output cap changes. 1uF should be enough. Previous posters are probably right- there's probably something limiting how much low end gets to the clipping stages. You'll most likely need a schematic to figure that out. At that point it should be as easy as replacing a cap and maybe a resistor (if it's an RC filter) but beware- some pedals get unstable when you do that. it may oscillate wildly or just sound like total crap. I've had that problem in the past.