Sound output from playback of an old blank/empty type 1 audio tape that has an undulating pattern of noise. The volume hasn't been adjusted, so this is true to the amount of noise present in a tape recording.
Rewind radio show on cassette-tape. Record with a technics m04 stereo cassette deck, rewind a cassette tape tdk a-60. Sound device realtek on-board (motherboard m5a 78l-m).
The hum of vehicles crossing a grated steel bridge deck. The bridge is the johnson st. Bridge in victoria, bc, canada, which is currently being prepped to be replaced.
Mono, close-mic recording of a roll of gaff tape slowly being peeled back. Microphone settings: akg 414, hypercardioid pattern, no high-pass filter to maximize proximity effect.