Not sure why ours had levers instead of knobs. Radioshack "pong" for Christmas. https://npub172mu27r5yny0nnmvgjqwhx055dmsesrrx7j0p5d3pxagfx6xgxfsv75p3q.blossom.band/59f63c6356f8defcd651c0ab85d7e666af7283a18548311b0f761929b7a71002.jpg