AirZounds is a bottle pumped up with your tire pump, what sound level adjustment there is ,
is just a rotary valve squeezing the hose connecting the soda bottle tank
and the horn.

Not really that loud, length of burst is more practical than air volume being restricted.

There is a fellow in the area has some air horns that he salvaged off Ships..
on top of his Pick up truck canopy .. really don't want to block his path ..