Just wanted to drop in and support this feature request. Spine is by far the best animation software for games that I've ever used. Ability to have the time line trigger a sound file in editor would make it perfect for me though. Sometimes it's important to sync sound and animation to work seamlessly together and having editor to playback desired sound file would really help and speed up this work.
Cheers for all your hard work on this awesome piece of software, my life is so much easier thanks to Spine.