I've found the volume has a lot to do with the key caps as well. For example, thick PBT key caps don't sound as loud to me as thin ABS. Then again, I bottom out when I type, so as others have said, your typing style plays a big factor.
If you're concerned with volume, then getting a clicky switch is not the way to go. I'm on the phone a good bit, so typing on MX-Blues was out of the question, so my office board uses MX-Black.
I don't know how much this will help, but I did a sound sample video that includes MX-Blues if you'd like to hear the difference.
Thanks mashby, this video is great! It helped alot
As far as the decibel thing goes, you guys are awesome, I also downloaded a decibel meter app just to check my mice (sensei raw, naos 3200 and delux m618) and with constant clicks surprisingly the delux was the softest of the three at about 48 db, the naos was second at 54 db, and finally the sensei raw at 58. Pitch-wise I'd say that the delux is the highest pitched, then the sensei then the naos, which is why it surprised me.
Sound-wise i personally like the blacks, which are harder to type on? Although it depends on your typing style?
And different keycaps contribute too? Man. And so the rabbit hole goes...
EDIT - I should've read through the first page more carefully, sorry about that. you guys had already answered some of my questions.
Spamray, what are "...GMK caps on plate mounted clears"? And how expensive are they?