DF2301QG change response voidce or delay listening time.

Hello, 

I'm building a droid with voice recognition, and instead of having the voice answer, I would like to have a mp3 droid sample play. 

I was thinking of catching the wake-up word ID when it's sent through serial and then play a sound with the mp3 player. However I'm worried that if the module is listening to a command while I'm plying the mp3 it will mess up the recognition. 

So is there a way to change the response voice or increase the time betwen the wake-up word and the time the module listen for a command ?