This is a rendering of a piece composed on the Threnoscope for a Call and Response event held at Cafe Oto in London (http://www.cafeoto.co.uk/project-space-call-and-response-multi-channel.shtm). The piece is for eight channel audio, but in this online version the eight channels have been mixed down to stereo. In the current Threnoscope visual representation the crossing lines on the interface represent the speaker setup and the circles are the harmonics of the 55Hz A note. The piece is in Pythagorean tuning.
The Threnoscope is a compositional system created by ixi audio (http://www.ixi-audio.net), for drones, live coding and microtonal composition. The system is still in early stages of development but will be released in the future. Further information about the Threnoscope can be found here: (http://www.ixi-software.net/thor/Magnusson_Live2013.pdf)