Use the volume knob on your USB keyboard with Quartz Composer compositions via the HID Input patch included with QC.
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Tag: rotary encoder
Toy Ingenuity
I like the little gems of ingenuity and economy of design found inside crappy toys. I was taking apart some electronic toys yesterday, as is my wont. This particular toy had a few neat mechanisms, but I thought this use of rotary encoders and cams was especially cool.