Update: 23:00 Thanks to elpaw for some clean up audio both forwards and backwards.
Thanks to Pumuckel for the following.
I don't knwo if somebody else has already done this but I played the sound from the second game on find815.com backwards. When you clicked on "Maxwell-group" in that eMail there was it and after some filters i got this:
I thinks he's saying something like "Your are into something...??? Stop..??". Maybe others have better ears.^^