This is an old commercial refrigerator from the grocery store. It was making a very nice regular droning sound so i placed my phone inside the fridge to get a clean recording without the noise from the store. Perfect for a spaceship drone or background noise at a factory.
Mono recording of a small cooking blender that, after some pitching and processing, i used as a layer for a robot's movement mechanism. Format: wav 48khz 24bit monogear: oktava mc 012 -> joemeek vc1qcs -> audiofuse interface.