Control CD and CDJ100 not controlling Serato

I have a CDJ100. The audio outputs of the CDJ100 are connected to PGM 1 1 on a Rane TTM57 SL - left to left, right to right. The Rane in turn is connected to some monitored speakers. When I play a regular CD the speakers work - I can hear the music. I then pop in the Serato control CD and connect the Rane via USB to a PC running Windows XP SP2 running a version of Serato I downloaded the other day. When I load one of the mp3's into the left virtual deck and try to play it via control of the CDJ100 nothing happens. I can however play songs in the virtual deck 100% controlling it from knobs on the Rane. I have tried two control CD's. The dip switches on the RANE are all in the UP position and PGM1 is set to Analog 1 and the 1 is lit up. Also J1, Deck 1 and 'Stereo House ' are on. Any assistance is appreciated.