  The inclusion of voice persona in synthesized voice can be significant in a
broad range of human-computer-interaction (HCI) applications, including
augmentative and assistive communication (AAC), artistic performance, and
design of virtual agents. We propose a framework to imbue compelling and
contextually-dependent expression within a synthesized voice by introducing the
role of the vocal persona within a synthesis system. In this framework, the
resultant 'tone of voice' is defined as a point existing within a continuous,
contextually-dependent probability space that is traversable by the user of the
voice. We also present initial findings of a thematic analysis of 10 interviews
with vocal studies and performance experts to further understand the role of
the vocal persona within a natural communication ecology. The themes identified
are then used to inform the design of the aforementioned framework.
