The reds are pretty much silent during the travel of the keystroke. They only sound they make is the thud the key makes when it bottoms out. I assume that its similar for the other silent switches like the blacks and the browns. The back plate probably has more influence over the sound than the switches themselves as his MX red board sounds much different from mine, which is a tad quieter than most rubber domes. However, the board with the alps is pretty much dead on (very loud.) This video is a better representation of the sound signature of the switches rather than the actual noise level. Its hard to really capture that without physically being in a room with one. If the noise gets to you too much you can always buy sound dampeners. http://www.wasdkeyboards.com/index.php/products/keyboard-accessories-2/cherry-mx-rubber-switch-dampeners.html