One idea drives another... If I havent read this thread, I would have a free afternoon, but now I have to pick up all the gear for my unit

I just got another idea. By changing the intermediate preassure on the valve of the 1.st stage regulator from example 8 bars and 4 bars, there will definetly be the distinct difference between sounds. One will be higher frequency, another lower, thus we'll have diferences of the buzzers sounds between fields. Another thing to test!