OK.
I got a response from Mad Bull. This product is NOT to be used with any gas other than CO2. No propane, no duster, CO2 only. They would not comment on whether or not it could technically be possible, as they likely haven't tested it - and by the sounds of it, they probably won't.
As for the earlier question as to whether or not the pressure can be tuned - no it cannot. Mad Bull also pointed out that the decibel output of the device is not enough to cause permanent hearing damage. Some sources say otherwise (regarding 120dB in general - not specifically the Mad Bull product).
More news from Mad Bull coming later today as well. I have received an email with another new product. This new one is slightly less controversial, LOL.
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