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Pryorphone: I am not so sure its compensating... that loop to the right of the 3rd valve tubing contains THE tuning slide, so my conclusion is that it must be in use all the time. The 1 to 3 tubing on the left side is not any longer than you would get going through the 2nd valve, so I can only assume that this was an experimental production model that did not prove worthwhile, hence the return to a standard flow in future models.
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