Aaaaa!, many thanks for the idea Corno. One of the local auto shops sell a fine weave "sound transparent" cloth that the auto junkies use to cover the speakers and boom boxes in their cars, that might also serve to keep out the dust as well as the fertiliser.
As to having the swell shutters close when the power is turned of, we looked at the possibility, but the swell shutters are held open by a spring, the close when a 3 stage bellows is inflated so no power + no wind to inflate=open shutters. And then we found out that inside the organ case the ceiling is so far from the wall that a swarm of batts can do aerial manouvers between the ceiling and wall (no builder or handyman is prepared to TRY and close the gap with the pipes in position).
Fortuanetly I haven't found any birds in the pipes yet (fortuanetly their to small for that).



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