Among the many effects offered under Voice Effects, is Warble. This will give your voice a bubbling effect, as if you’re speaking underwater. To engage the preset Warble effect, click Voice Effects. From the menu that appears, click Warble. The icon to the left of the effect will then be highlighted to show it’s been engaged. To end the effect, click Warble again.
To create customized Warble effects, use the Warble slider on the Voice Cloak Plus interface. Simply click Monitor Your Voice, then slide the Warble slider up or down to achieve the effect you desire.