Hello,
i tried to play an animated gif like in the example and added the code to play a .wav audiofile with the teensy audio shield. Both files (gif and .wav) are stored on the SD-Card. But it only works one of them. If i play the audio first in the code, than the audio plays, if i first play the gif, than the gif is playing without sound. It seems that they dont can be played together. I also tried to play the music from another SD-Card on the audio shield instead of the internal SD-Card reader in the teensy 3.6. But it did not help.