Here are some pictures of a little synthesizer I made. It's made to hang below an electric guitar. It 's designed around the Soundgin chip and is controlled by a Picaxe microcontroller. I call it the WidStick. Its sound can be modulated by moving your hand over the end of the tube. Click the following link to hear a sample of one of the sounds it can make. widstick.wav
Here is a link to a YouTube video of a couple of other synths I made. One of them is called the Electrocarina and it's a kind of electronic ocarina. The other is a violin-like instrument called a Fiddlestick.