11. A computer storage device, having computer-executable instructions that, when executed by at least one processor, perform a method for converting text-to-speech, the method comprising: receiving text input into a plurality of first level recurrent neural networks; determining, by a first recurrent neural network in the plurality of first level recurrent neural networks, one or more properties of the text input from the group consisting of: part-of-speech properties, phonemes, linguistic prosody properties, contextual properties, and semantic properties; determining, by a second recurrent neural network in the plurality of first level recurrent neural networks, one or more properties of the text input from the group consisting of: part-of-speech properties, phonemes, linguistic prosody properties, contextual properties, and semantic properties, wherein the determined one or properties by the second recurrent neural network is different from the determined one or more properties by the first recurrent neural network; receiving, by a recurrent neural network in a second level, the determined properties from the first recurrent neural network in the plurality of first level recurrent neural networks and the second recurrent neural networks in the plurality of first level recurrent neural networks; determining by the recurrent neural network in the second level, phonetic properties for the text input based on the properties received from the first recurrent neural network in the plurality of first level recurrent neural networks and the second neural network in the plurality of first level recurrent neural networks, wherein the recurrent neural network in the second level is different from the first recurrent neural network in the plurality of first level recurrent neural networks and the second recurrent neural network in the plurality of first level recurrent neural networks; and based on the determined phonetic properties, generating a generation sequence for synthetization by an audio synthesizer.
11. A computer storage device, having computer-executable instructions that, when executed by at least one processor, perform a method for converting text-to-speech, the method comprising: receiving text input into a plurality of first level recurrent neural networks; determining, by a first recurrent neural network in the plurality of first level recurrent neural networks, one or more properties of the text input from the group consisting of: part-of-speech properties, phonemes, linguistic prosody properties, contextual properties, and semantic properties; determining, by a second recurrent neural network in the plurality of first level recurrent neural networks, one or more properties of the text input from the group consisting of: part-of-speech properties, phonemes, linguistic prosody properties, contextual properties, and semantic properties, wherein the determined one or properties by the second recurrent neural network is different from the determined one or more properties by the first recurrent neural network; receiving, by a recurrent neural network in a second level, the determined properties from the first recurrent neural network in the plurality of first level recurrent neural networks and the second recurrent neural networks in the plurality of first level recurrent neural networks; determining by the recurrent neural network in the second level, phonetic properties for the text input based on the properties received from the first recurrent neural network in the plurality of first level recurrent neural networks and the second neural network in the plurality of first level recurrent neural networks, wherein the recurrent neural network in the second level is different from the first recurrent neural network in the plurality of first level recurrent neural networks and the second recurrent neural network in the plurality of first level recurrent neural networks; and based on the determined phonetic properties, generating a generation sequence for synthetization by an audio synthesizer. 16. The computer storage device of claim 11 , wherein the one or more properties are received as a dense auxiliary input.