UTL-4: The UTL-4 is a passive* 10 channel bi-directional 1/8" <=> 1/4" format jumbler. The UTL-4 comes in handy when interfacing different modular systems together. Built from the same die cast aluminum enclosures used for boutique effects pedals, the UTL-4 is built like a tank and can take a beating. *this unit is passive and does not perform any voltage/level scaling/offsets