 To mix the show, Jacob used two Altec 1567A four-channel rotary knob mixers linked together, one for the four drum microphones (kick, snare, overhead left and overhead right), and one for the vocal microphones, which consisted of Hendrix on lead vocals, bassist Noel Redding on backing vocals, and one channel for Jacob to announce the band at the start of the show.No microphones were needed for lead guitar or bass guitar, which had their own amplifiers.The stage monitor system was simply two Altec 604E sidefills which took their signal from a custom McCune-designed combiner fed with inputs from the two Altec mixers' auxiliary outputs.