reds would remove the tactility yes, as for sound, they would remove the click you hear with blues, but if you bottom out you will still hear the "thunk" from the stem hitting the bottm of the housing. So if you can type without bottoming out, the only noise you would hear would be the switch returning to the top of the housing, which would be very very minimal.
E: WASD has a nice video comparing the three major switch types.
reds would sound the same as blacks, just require less force to actuate/bottom out