Shake your Rack. This module can modulate the cable tension, opacity, the zoom factor and the scroll position of your rack.
This input has a range from 0 V to 10 V and changes the cable tension from 0 to 1.
The opacity input has the same range from 0 V to 10 V and changes the cable opacity from 0 % to 100%.
The zoom input has a range from -10 V to +10 V. This is scaled down to the range -2 to +2. The formula used by Rack to calculate the zoom factor is 2^n. So for an input voltage of 0 V, the zoom factor is 1, or 100%. For -10 V it is 25% and for +10 V it is 400%.
You can start and stop the effect with the on/off button. If a cable is connected to the zoom input, you can also stop the effect by manually zooming, for example by holding down the ctrl-key and moving the mouse wheel.
If your rack is zooming or moving like crazy and you can't stop it, go to the
menu Engine->Sample Rate->Pause:
This sets the on/off button to the off position as well.