billroy:
Here is a thread that suggests 0-10 psi is the normal human production playing the flute.
2.3 PSI (120 mm Hg) is normal blood pressure and about the best that a fit person can blow in short bursts. 3.5 PSI (180 mm Hg) is dying. The 6 PSI stated by your thread sounds remarkably high.
To the OP's question, the best suggestion I can think of for an inexpensive, quiet pump would be the compressor from a refrigerator. Google will turn up a few results on how woodworkers convert them for use as vacuum presses.