This post assumes that you are familiar with the previous Circuit Bending Basics Posts.
Circuit bending is about the non-thereoretical exploration of sound making circuits via shorting different points together. Take a toy (that is battery powered - important!) and let's get to work!
Multi Button Triggering
A previous post demonstrated how to trigger a single button using a 4066 chip. The 4066 chip has four such functional blocks. This article demonstrates how to use all four of these blocks. It is a assumed that you have read the previous post in question.
The red pair, yellow pair, green pair and orange pair of connections each represent a pair of points on a circuit board that triggers sounds and thus replaces buttons.
Download here: http://milkcrate.com.au/_other/downloads/projects/_4066_example/_4066_example.ino
Example - Toy Keyboard