IndyGuitarist.com has loads of info for the average musician looking to modify or build effect pedals, even if they have no electronics experience. Their latest book lists modifications for over eighty different pedals, including several bass effects.

From Indyguitarist.com:

The Book Includes:

Complete details on how to modify over 80 different effect pedals

Basic Definitions and Concepts of effect pedals, their circuitry, and modifications

Video "walkthroughs" of various circuits

Detailed close-up pictures of the pedal's circuit boards showing where the parts are located

Parts list, where to buy the parts and their catalog numbers included

Download videos on how to solder/desolder

Download video on how to modify an effect pedal

Tools and Items you'll need to purchase first (one time purchase, about $15 cost)

How to Desolder guide

How to Solder guide

How to Modify Guitar Pedals guide

All About Components, the different types, and what they do in guitar pedals

How to build an "audio probe" - a device to help you fix nearly any pedal easily

How to use a multimeter

How to read and understand schematics

Installing Pots and Switches to control mods

Installing a Pot in place of a Resistor (add your own bass/ mids/ treble controls!)

True Bypass Box Diagram

Most pedals have several different modifications that can be performed, all included!

Free updates for one year

Free technical support for one year

Free modification consulting for one year - we'll help you design your own mods to tailor your pedals to your needs

Money back Guarantee