A distant motorway
Starting with a rising crescendo of noise from the initial note, this ambience settles into a distant rumble not unlike the sound of a motorway heard from a distance. The Note is repeated in the middle, creating another rising tone and then settling down into the same rumble.
This was made in LMMS using the VST Gigamate V2 with the oscillations dipped to a minimum and the noise, ring and polyphonics turned up