Disclosed are apparatus and methods for generating synthesized utterances related to output of commands. A command is received at a computing device. A textual output for the command is determined using the computing device. A spoken output of the computing device is generated that utilizes a plurality of vocal characteristic sets. At least a portion of the spoken output corresponds to the textual output. At least a first part of the spoken output utilizes vocal characteristics of a first vocal characteristic set. At least a second part of the spoken output utilizes vocal characteristics of a second vocal characteristic set, where at least some of the vocal characteristics of the first vocal characteristic set differ from the vocal characteristics of the second vocal characteristic set.