I think that perhaps in the future after a good deal more has been done to the site, and additions completed, that roll20 should add voice effects and changers to the roll20 mic and video. This would be good in allowing us DM's who aren't the best at voice imitation or acting to give flair to when a NPC is speaking. STuff like double voice, deeper, demonic, echo, static, gender swap(when you're acting the princess or barmaid.)all the bells and whistles. This would make it an easy tool for DMs to act out their NPC's and draw in their Players into the story.