Take enough breaks, drink room-temperature water (before you are actually thirsty), and do not push your voice to the limits (if you are untrained, the voice quality might change as you get tired).
Avoid strong sugary or salty snacks/drinks so as not to dry out your vocal chords or cause an abnormal production of mucous that might impair your way of speaking.
Avoid big meals during the recordings. You should read a few sentences before the real recording starts, to warm up the voice. Exaggerated or very “jumpy” intonation might produce a somewhat mediocre synthesis result. Be aware that your TTS will sound relatively similar to the way you choose to speak. Listen to your own recordings from previous sessions prior to the start of the new one and stick to your own voice and microphone settings from the previous sessions. If your nose is blocked, you will sound more nasal. Keep the same pace and a similar pitch level, intonation, speech rate and voice quality as in previous sessions. Well-articulated and steady speech and breathing may give better segmentation results, but keep the pronunciation natural by all means (do not over pronounce separate sounds or syllables). Keep to the pronunciation in the sound example for each sentence and keep a constant speech rate and voice volume throughout the sessions. 
Try to make volume/clipping controlled recordings and use a good quality microphone.
Acappella voice how to#
Here is a list of tips for the recording session and on how to improve the voice quality:
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