This was a home recording made with a rechargeable safety signal air horn. When the air supply in the canister is depleted, it is replenished by means of a small hand held pump.
Made this sound in audacity in around 5 minutes. Tried to make a sound for my game, but found that this could be useful in other games. Maybe a powerup?.
A sound that's supposed to sound like a sword being drawn, made with a recording of me hitting a metal pipe with a pencil and a bit of computer editing.