audio and movement synch. 2 songs at the same time

yes. it should be a stereo file. it's a long story about the puppet. but.. fact is:
i need a puppet. (it's a 2d-cardboard puppet)
the arm- and mouthmovement of the puppet is controlled by two servos.
the servos are controlled by the left and right channel of the sound file (via shifty vu shield)
aaaaand last but not least the song must be played in best quality. best quality = the final mix.

it's no option for me to mix it afterwards. the "real" song has more guitars and more voices. and i arranged the song the way i wanted. on sound issues I wouldn't be happy with a compromise.

in between...im not using speaker in the puppet. maybe just headphones.
in the end it's going to be something like a life musicvideo. im going to capture the whole thing with a camera in real time and show it on a TV.

what's about the rMp3 (http://www.arduino.cc/cgi-bin/yabb2/YaBB.pl?num=1259561121)

  1. is it possible to play two files at the same time with one of it?
  2. is it possible to play two files at the same time with two of them?
    any experiences?