There is no CD track on a DVD-A, the OP is almost certainly just playing the DVD-V portion of the DVD-A's he has played in his player. As Eddie501 indicates most all DVD-A's also have a DVD-V portion with Dolby Digital or DTS or PCM audio that can be played by almost any standard DVD player and all Blu-ray players.
If in fact Panasonic has made the DMP-BD55 a DVD-A player, I would be very surprised and since I have never seen any mention of this besides this post here, my opinion is the chance is almost zero it does play DVD-A.
Chris
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