Studio-Quality Vocal Stompbox for Large Group-Sound Effects. With the CRITICAL MASS you have the magic right to your feet. This stompbox is easy to use. You don't have to set anything but just start singing.
Critical Mass is a simple-to-use vocal stompbox and lets you easily create stunning group-sound vocal effects. You don't need a key or scale to set, but just start singing. The simple three-knob control gets you up and running in a few seconds.
The Critical Mass can be powered via an external 9V adapter or batteries (not included).