When regular controls just aren't large enough - arcade buttons are the next step. This was the theory turned into practice by 'fraganator' who has made an amazing Arduino-based MIDI controller. Here is a detailed video demonstration of the controller in action:
Although there are a few Arduino-based MIDI controllers around for inspection, this unit is one of the best - for the performance, and the fact that the designer has published complete details including Arduino code, housing dimensions and circuitry. For more information and to get started visit here. When working on your own embedded-Arduino projects, consider the Freetronics LeoStick - one of the smallest Arduino-compatibles on the market with onboard USB, piezo and RGB LED:
