A simple synth using a 40106 for the oscillator, and a series of trimpots and switches. Each trimpot/switch combo is tuned to a specific note, which allows the switches to be played like a keyboard.
You can see a great tutorial for making the oscillator on Lorin Parker's website - http://www.electricwestern.com/
Just replace the single pot in Lorin's tutorial with trimpots and switches.
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