Howard is using a vacuum set to blow to clean out the channels of the windchest. You can see the slider to the left. The slider moves back and forth to either align or block the holes. If there is air, there is noise. The groves in the windchest are also known as channels. Their purpose is to allow excess wind or (in some OTHER builders instruments) leakage to flow without getting into the wrong pipe. Trust me, that is a bad situation!
On the left Jerome is using the rocker arms to pull the pallet open to let the air and junk out.
In Jerome's picture, the levels of the windchest can be seen. Beneath are the rocker arms, then there is the windchest proper (The area above Jerome's hand is usally sealed) , the pallets, the channels are not visible, then the sliders, toeboards, and rackboards.
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