Here's a really clear online text to speech system.  I think I'm going to use it to record some Taranis-specific audio files for the APM.  QueenElizabeth is I think a really good voice for this, as it seems to be quite legible (what's the audio equivalent of legible?).

Audio file parameters:  mono, 32KHz, WAV, Signed 16 bit PCM, clear all metadata