Each key plays a different sample. The bottom keys are mostly drum sounds and the top keys are more sound effects. You can replace the samples with your own. The Aux button controls a sequencer: hold it down to enable recording, begin playing to start a recording, and press Aux again to finish.

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Knob1: Sample Playback Speed

Knob2: Reverb Amount

Knob3: Dry / Wet Mix

Knob4: Decay

Aux: Sequencer Control

Foot Switch: N/A