More YouTube video this morning, this time from the Ryoji Ikeda piece spectra [paris] that was on last Saturday night in Paris.
The audio is not good - it was so loud that the poor Canon camera's microphone couldn't deal with it - but I did accidentally capture the beginning part of the heart of the sound (which repeated approximately every 30 minutes): the bass tone comes in a quick pulse and then begins to slow down. After this video ends, the bass would speed back up to where it started and then fade out, leaving the every-12-seconds blip for about 20 more minutes until it started cycling through again.
Anyhow, this is enough to give you the idea of it. Oh, and apologies for crappy video too - I just set the camera down on one of the skylight boxes and couldn't tell if it was pointed the right way or what. Still, it's better than nothing!