Low pitch static which reminds me of 1950s sci-fi television. Created by filtering a static wave from an analog radio then slowing the pitch and adding a mechanization effect.
19th harmonic minor triad on C. MIDI pitch bend matches intervals.
Author: Created by Hyacinth (talk) in Sibelius 5 with midi pitch bend on 26,63 for 297.513016 cents rather than 300 and 80,64 for 701.953125 cents rather than 700.