E-MU PROFORMANCE/1 Preset piano sound module. Each knob functions correctly, but the volume only operates at maximum. Please adjust the volume on the input device. We cannot provide any warranty for untested functions. *This is a very old used item, so there may be stains, discoloration, dullness, scratches, and scuffs. Please check the images before purchasing. Returns or exchanges due to scratches or stains are not accepted as they are based on personal subjective judgment. *The product is photographed with a smartphone. The color and condition may differ from the actual product. There may be scratches or stains that are difficult to see. No claims and no returns are accepted. Please understand and purchase accordingly. *All included accessories are shown in the photos. Thank you for your understanding and purchase.