Sound adds very much to the atmosphere and general tone of the animation.
Examples:
DEMO Adobe Premiere and its sound editing ability
NOTES:
Before you load the images into photoshop, make a blank video layer and then change the document settings to the appropriate length and frames per second...THEN import your images as a video layer from a file.
What happens if you change it after the fact, it drops the frames in-between.
Links to help with Premiere:
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