In order to perform Stockhausen's "Spiral" I designed a built a small footprint quadraphonic mixer. The mixer has four discreet inputs for Front Left, Front Right, Rear Left, and Rear Right outputs, each controlled by a Penny & Giles fader. There are two additional mono channels with a P&G fader and a P&G quad pan pot plus post-pan 4 channel aux send. These channels are summed post-pan with the main bus and the overall level is controlled via 4 Studer A101 VCAs controlled by one master fader for super-accurate tracking.