Jumping all 4 Channels of a Marshall Super PA PLEXI - Instant WOODSTOCK.

Demo of a Marshall Super PA Plexi model 1968 which also from early 1968. I’m playing it with a Gibson Les 1959 Standard reissue and two 1971 Marshall 1982A&B 4x12 cabinets with G12H30 55Hz Pulsonic Celestion Greenbacks. Jumping the channels means that I’m playing all 4 channels at once!