A bassguitar pedal, compressor-limiter, specially engineered for dynamic sound modification. It uses a passive, sound transparent optical system designed not to alter the original sound and making it virtually noiseless. Tux operates in two different switch selectable modes: SOLID - clean, pure sound, very dynamic with a distinctive punch and TUBE - compression characteristic for tube design. This option gives a harder compression and warmer sound. The stomp-box features the polarity auto detection, which allows using bothe centre-positive and negative polarity and a DC assistant. The dimensions of the pedal are 65 x 96 x 144 mm and the weight 0,5 kg.