No, the default audio in a GoPro Studio template is fixed and cannot be moved or replaced. However if you really want to accomplish that effect, here is how you would do it:

  1. Lower the Audio Setting "LEVEL dB" to 0.
  2. Add your desired music track to the second audio track in the Storyboard.

Note: Be careful when doing this as it may throw off the feel of the provided template as the template was created with the provided music track in mind.