INERTIA is a spinning brass disk wired into a failing power supply. Grab it and throw it round. The faster it turns, the harder it screams. Let go and it coasts down under its own weight, pitch sinking as it slows. Hold your finger on it and it brakes. Drag it backwards and the whole machine drops an octave and goes dark, the sound turning round the stereo field as the disk turns. Spin it by hand. Switch on the MOTOR and set the RPM. Or play it from a MIDI keyboard and let the notes drive it.