A musical instrument connection and extension system that easily and quickly connects musical amplification, effects pedals, rack mounted effects systems and components, wireless connectivity and power distribution for use with musical instruments. Audio stage equipment multiplexing/demultiplexing system comprising: Front station (30), multi wire cable (101), back station (20). The invention concerns several options for the mechanical arrangements of plugs, connectors, aggregated cables, DC power, both in the front stage station and in the back station. On stage effect pedals, switches or foot-pedals are thus provided with DC power from the back stage station and can be connected more efficiently, reducing the number of external power supplies and cords.