Check out the demo after the break. This isn’t the first time we’ve seen a rotary dial used to control volume, but that’s one of the minor selling points of this rotary cell phone.

He pulled off a fairly complicated hack which now lets him control speakers via Bluetooth. He had a set of Creative brand computer speakers with a volume ... just go with a rotary encoder.

It has a 3.5mm aux input with its own volume rotary knob ... The flexibility this speaker offers to connect instruments while being able to control each input's volume individually makes this ...