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I found at least a temporary solution for this by installing a tapered rubber plug in the vent hole with an 1/8" hole drilled through it. This solved whatever resonance issue was causing the noise, hopefully while maintaining the ability to create a vent to atmosphere when needed. I have a durametric cable, and am in the process of setting that software up so I can test the valves. I hope to avoid the usual situation in which a "temporary" solution is forever. :-)
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