Just read a forum post from an IVR developer asking how to increase the volume for his IVR application. But the question I had for him was: do you mean to increase the volume of your TTS prompts or do you mean to increase the volume of your prerecorded audio?
To increase the volume of TTS prompts, you can use the <prosody> tag for IVR. You can set the volume attribute of the <prosody> tag to “Silent”, “Soft”, “Medium”, “Loud”, or “Default”. The volume attribute can also be set to an integer value such as “25.0″ or “100.0″. Additionally, the volume attribute can be set to a percentage such as “+25%” or “-25%”.
However, please keep in mind that when using the <prosody> tag for Realspeak TTS, the talking speed and volume of the TTS voice does not revert back to the normal speed after the tag has been used. To revert it back to normal, you must use the <prosody> tag again with the attribute of “volume” set to “100.0″ and the attribute of “rate” set to “default”.
For prerecorded audio prompts, you would not be able to use the <prosody> tag for your IVR application. Instead, you would have to either:
1) Re-record the audio prompts so that they are louder.
OR
2) Use a tool such as SoX to increase the gain on the existing audio prompts. This site provides some tips on how you might do this.
Hope these suggestions help you IVR developers out there.
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