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“HVAC Cosplay”

Where the duct ley lines create a confluence of overtones

I’ve come to recognize that the sounds I aspire to make on my modular synthesizer are, often as not, the sounds that I hear in public transportation and HVAC systems. I had several titles planned for this, but in the end it is HVAC cosplay. It is a synthesizer disguising itself as a semi-industrial drone, the drone the product of the infrastructure of some imagined generic place, an office building, a hotel, a school, that works very hard to disguise the presence of its infrastructure. The drone is the evidence of infrastructure that seeps into view — into hearing view, that is, into earshot — when your elevator is stuck between floors, or you find yourself in a subbasement because of poor wayfinding signage in the staircase, or most opportunely at a particular spot in a hall where the duct ley lines create a confluence of overtones. The sound may not even be present in the world; it may be specific to how your ear receives and contorts the sound. You alone may be witness to a particular signal.

More practically, the overtones here are the result of three different oscillators on my modular synthesizer being heard in unison, impacting each other, and being impacted by a handful of low frequency oscillators. Some frequency bands within those main oscillators themselves are being impacted by variations on the low frequency oscillations, and then amid it all one of those three main oscillators occasionally is triggered to move up and down an octave, at times suggesting a tonal center, at others testing the contours of the system’s comfort zone.

More specifically, for those playing along at home, the three oscillators are: an Intellijel Dixie II, a Hikari Sine, and a Pittsburgh Oscillator. The LFOs are all courtesy of a single module, the Xaoc Batumi (I just installed it last night; this is my first patch with it). The filter bank is an ADDAC 601. There’s a Doepfer A-121 and a Circuit Abbey Invy in the mix, too, as well as a 2hp Filt. They keyboard is a QuNexus, doing its thing on the Dixie II. I’ve long fiddled with oscillators to try to engender dense, rich tones, and this is closer to what I’ve been trying for than anything I’ve done until now.

By Marc Weidenbaum

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  • Marc Weidenbaum founded the website Disquiet.com in 1996 at the intersection of sound, art, and technology, and since 2012 has moderated the Disquiet Junto, an active online community of weekly music/sonic projects. He has written for Nature, Boing Boing, The Wire, Pitchfork, and NewMusicBox, among other periodicals. He is the author of the 33 1⁄3 book on Aphex Twin’s classic album Selected Ambient Works Volume II. Read more about his sonic consultancy, teaching, sound art, and work in film, comics, and other media

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