00-5 inch speakers coalesced the output from nearby trees (branches, leaves, limbs from Duluth Minnesota US) via the Terrain Instrument 202, an here all incoming signal sources into HRM were processed through this Intel 8080 microprocessor. These were used to trigger the on/off sounds from individual instruments. The B&W image depicts the physical arrangement and umbelical cabeling. From the 200 speakers the two vertical planes speakers were cabled to the 8080's 5-watt output board via Centronics connectors .(up to 500 inputs/200 outputs into 5 watt amplifiers: RCA inputs/outputs. Additionally, analog two-way, 600 Ohm equalized telco pairs provided the realtime call-up and used by a pair of infinity transmitters. The keyboard AD/DA switches assigned sound to individual speakers #s, grouping them either top to bottom or back and for the between suspended speakers, and the 200, 5 watt amps produced sandwich auralities for those seated on free pillows or walking about. BTW, hot dogs, etc were offered throughout the performance.