Limor of Adafruit Industries posted this video demonstrating how the Waveshield kit can turn Arduino into a sample-bending audio tool.

Consider for a moment that potentiometer replaced by – oh let’s say – photocells or maybe a force-sensing resistor. If you’ll excuse me – I’ve got some experimentation to go do – Wave Shield for Arduino

Related:
Waveshield Crop
Wave Shield kit for Arduino

In the Maker Shed:
Arduino Diecimilia Crop
Arduino Diecimila