partially veiled
Lo Boob Oscillator
I don't know what causes it Prog, but I also have the "vibratory" noise with my PD. I only notice it when I smack the bottom a little too hard (making sure the unit is clean after using). It's funny too because it's like, I hit it once and no sound, hit it twice and there's still no sound, three times and there it is. Not always three times, but it doesn't always ring, is what I'm trying to say. I would also be interested to know what causes this.