Needs review
Source: Dragon Magazine #359

Description: You can alter and modulate your voice to give you a host of different vocal effects.

Prerequisites: INT 13, 16th Level Arcane Caster

You can alter and modulate your voice to give you a host of different vocal effects, making you sound terrifying or alien. You gain a +1 bonus on Disguise, Intimidate, and Perform checks made when using your voice.

In addition, you can speak in a normal tone, or even a whisper, to creatures within 1 mile). You may choose to cause specific listeners (rather than all within shouting distance) to hear your voice, but you must be aware of their presence and general location. No line of sight or line of effect is needed, however.