In the allassonic effect, is it the column of water that is actually creating the sound (the surface of the water passing vibrations into the air), or is it that the water acts as a damper on the cup, and that it is the vibration of the cup, like a bell, that actually creates the sound waves? Another way of putting the question is - is the water's roll that of primary vibrator with the cup merely holding the water, or is it that the "system" (cup and water) that vibrates, and thus creates the sound. Would there be a way to create the allassonic effect with a container that itself was not allowed to vibrate, or at least was damped as much as possible, so that it was effectively the water only that is vibrating? Am I thinking about his wrong? Is it really that the cup and the water vibrate relatively independently from one another, each creating their own sound waves, and that I am actually hearing a combination of their vibrations? I found an interesting version of this effect with cold water from our deep sink faucet. (It doesn't work with water from kitchen sink.) If I put cold water in the cup and tap, the pitch initially slowly drops, and then after a while, starts going up again. My guess is that there are air bubbles and that the initial dropping is from the consolidation of air bubbles into larger bubbles, and that the raising of the pitch is a result of the bubbles leaving the water. Does this make sense?