scanner air waves, background interference
phone background futz noise on the line
Audience leaving theater at the end of a play.
London street market, voices, footsteps.
A quiet room tone from a guest room.
Tunnel station ambiance with announcements, crowd chatter and train bys.
Inside a refrigerator ambient background.
A refrigerator or freezer ambient hum.
Suburban air tone, faint birds and constant water running