You are able to magically conceal sounds that you make.

Prerequisite(s): Stealth 12 ranks, 5th-level arcane trickster

Benefit: You can magically conceal any sounds that you make for 1 round. Activating this ability is a free action and you may remain silenced for a number of rounds equal to your caster level. These rounds need not be consecutive. You may not use this ability and cast a spell requiring a verbal component during the same round.