When using older versions of E-Prime 2.0 (before 188.8.131.52), 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 184.108.40.206 or later.
This item has been corrected in E-Prime 220.127.116.11.