If you've ever seen a Jewish man with strings hanging out of his clothing, this is probably what you were seeing. There is no particular religious significance to the tallit (shawl) itself, other than the fact that it holds the tzitzit (fringes) on its corners.
Sound pressure or acoustic pressure is the local pressure deviation from the ambient (average, or equilibrium) atmospheric pressure, caused by a sound wave. In air, sound pressure can be measured using a microphone, and in water with a hydrophone. The SI unit of sound pressure is the pascal (Pa).
The sound pressure amplitude is the maximum value of the sound pressure. Since the sound pressure p is a periodic quantity, it is specified as effective sound pressure p RMS (root mean square). The change in the amplitude has nothing to do with the change in pitch (frequency) and vice versa.