A Marshall Plexi has 4 inputs and 2 channels. Using a JUMPER cable or patch cable you can play both channels at the same time and create new sounds. In this video I go through how I do that. This concept is referred to by a bunch of names like Jumpering, Jumping, Bridging and so on. I'm using a 2015 Marshall 1987X 50W Lead Plexi Reissue with a 1971 Marshall 1960B 4x12 with 1973 G12M25 75Hz Pulsonic Greenbacks, playing a 2013 Gibson SG Standard Aged Custom Shop with a late 1970s DiMarzio Super 2 K10 in the bridge position.