Tony, the device Don is using is a CPPB device, which is used to increase the internal pulmonary pressure, which in turn forces any excess fluid from the alveolar spaces within the lung. Those fluids are then excreted by the kidneys. Essentially, the device is used to combat congestive heart failure and has proven quite effective for decades.
Cheers,
Gary
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PSR-S950, TC Helicon Harmony-M, Digitech VR, Samson Q7, Sennheiser E855, Custom Console, and lots of other silly stuff!
K+E=W (Knowledge Plus Experience = Wisdom.)