When using older versions of E-Prime 2.0 (before 220.127.116.11), some users reported issues when implementing the Loop feature when using a SoundOut or SlideSoudOut object with the Loop property assigned to Yes. The experiment run results in the sound not looping. The sound will either play only once, or it will play with cracks, pops, or static.
Update to E-Prime 18.104.22.168 or later.
This item has been corrected in E-Prime 22.214.171.124.