The new Raspberry ... is that different pins can handle the same purpose. For audio the Greater Than Zero Pis (GTZPi) use PWM0_OUT and PWM1_OUT on the processor’s GPIO pins 40 and 45.
Here’s a Raspberry Pi hack that adds web control using PHP ... which allows you to change the state of the GPIO pins. It’s not super-complicated, but it is nice to see a step-by-step guide ...
First developed as a way for British students to improve their coding skills, the Raspberry Pi has opened up a world of new projects. Here four for inspiration.