Face Detector to Trigger Aka Speech

I have been making this patch for a uni project and my lecture suggested using the aka.speech to emit random messages from a set library of messages I will prepare, instead of triggering a piece of audio. Therefore the face recognition will have to trigger the aka.speech message and play it to the onlooker, but the messages must be random, as some messages will be nice and other not so.
I have enclosed my patch and as I have never used the aka.speech I dont know where to start with regards to setting it up to my patch, any help would be much appreciated, thanks.