1. A method comprising: receiving, at a network-based automatic speech processing system and from a network client not having access to information of internal operations of the network-based automatic speech processing system, a request to generate a text-to-speech voice, the request comprising a transcription; extracting sound units from speech samples based on the transcription; generating a demonstration of the text-to-speech voice based only on the sound units and the transcriptions, wherein the text-to-speech voice is language agnostic; and providing access to the demonstration to the network client.