I have a theory that if you route an infeed extension on the compressor (to a location away from your operating area), that the inconvenience can be lessened. You would have to step up the diameter by one or two pipe sizes (depending on the length), so as not to restrict the supply. Most of the noise a piston type compressor makes is at the infeed. If you can move the infeed source, you should be able to move most of the noise.
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Paul... is that you ??
Are you still with Anatol & in Chicago ?