Here is circuit bending DIY sound box created from five chips from electronic toys :) and several additional ICs in filters and triggers which inspired the creation of SoundScaper app.
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Would like to know what is "Circuit bending"?
Know more about circuit bending (Wikipedia)
Interested in circuit bending? Here are some great guides to get you started:
Circuit Bending For Beginners
Simple Ways to Circuit Bend a Toy
Reed Ghazala - Art Of Circuit Bending