# Use Alternative Voices
Automated testing for IVR relies upon generating audio to talk with the phone system we are testing.
By default, we use the Watson
en-US_MichaelV2Voice. We also offer a broad selection of other voices from:
- Amazon Polly
- Google TTS
- Watson TTS
Additionally, when the Locale field is changed, the choices for voice testing will be updated.
# Changing Voices
To change the voice being used, simply pick a different one from the voice drop-down.
# Using Recorded Audio
Alternatively, to use recorded audio for a test, simply insert a URL to an audio file into the "Input" field.
That will be used instead of Text-To-Speech.
Accepted formats are
mp3. Simply insert the URL in the field, such as below: