Legend LX venturi control test

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rriis

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Hi, I have a Legend LX that according to the service manual, there is a venturi test where I can test the control to see if it is working correctly. It says the following:

a. To test the venturi contol, place the lever in the plus position (which I do)
b. Depress the purge cover. You should get loud, run away freeflow (which I do)
c. While the regulator is freeflowing, move the venturi lever to the minus position. The freeflow should stop abrubtly. If it doesn't stop abrubtly, the crown orifice may be out too far. Try turning it in (clockwise) 1/8 or a turn and try again.

I have done all this, but when they say freeflow, I guess I'm assuming the air should stop? Now that I think about it, that doesn't sound right. To run this test, would the reg need to be in water? I hear a change in the tone of the air but it doesn't "stop" the air.

Any insight into this would be helpful, thanks in advance. BTW, I have adjusted the crown orifice but it doesn't seem to make any difference.
 
https://www.shearwater.com/products/swift/

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