Sample page: See menu at top for list of BABYMETAL song reactions:
Usage:
- Click on video in left column to watch the reaction video
- leave video in at small size until the person doing the reaction tells you to start playing the original video, then click on the video in the right column
- You may have to briefly pause either video to get the 'perfect' sync
- Once the videos are synced to your liking, bring the video on the left up to full screen and enjoy.
Pro-tip (Thanks Misuta Kitsune) Before watching the reaction video, start the Music Video, let it play for a second, then pause it and drag the timeline back to zero. This should get rid of any pre-start buffering issues and help make it easier to sync the videos.