6. A computer-implemented method comprising: receiving, by a computing device comprising one or more processors, a first request to generate a first audio representation of a first text; determining, based at least on a first characteristic of the computing device, to use a local text-to-speech module to generate the first audio representation; generating the first audio representation using the local text-to-speech module; receiving a second request to generate a second audio representation of a second text; determining, based at least on a second characteristic of the computing device, to use a remote text-to-speech system to generate the second audio representation; sending the second text to the remote text-to-speech system; and receiving the second audio representation from the remote text-to-speech system.
6. A computer-implemented method comprising: receiving, by a computing device comprising one or more processors, a first request to generate a first audio representation of a first text; determining, based at least on a first characteristic of the computing device, to use a local text-to-speech module to generate the first audio representation; generating the first audio representation using the local text-to-speech module; receiving a second request to generate a second audio representation of a second text; determining, based at least on a second characteristic of the computing device, to use a remote text-to-speech system to generate the second audio representation; sending the second text to the remote text-to-speech system; and receiving the second audio representation from the remote text-to-speech system. 11. The computer-implemented method of claim 6 , further comprising performing one or more preprocessing operations to the second text.