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DEPTH controls the overall strength of the vibe effect. Start with a lower setting for a nice, subtle effect, and turn it up to send your sound whirling around the room. The SPEED knob lets you adjust how fast or slow your sound modulates - no matter what the depth, or what mode you're in. LEVEL lets you adjust the overall output of your Viper pedal. Use the MODE button to switch between the two classic vibe modes - a rotating speaker effect and a subtler vibrato sound. The TRIM dial on the back of the unit (accessible using a flat-head screwdriver) lets you shape the intensity and character of your vibe sound. Experiment to get just the vibe you're looking for