I just googled and find here was a few posters talked about hemi-sync. I wonder if there is any guys know more about WAVE I, I like #1, #2 and not very sure about #3, since REBAL is hard to understand, last week I began WAVE I #4, then I felt always “click-out” - never finished a single session of #4, about half of #4 then fall sleep, 
How do you image while the vocal introduce something like ECB, which kinda stuff will bring into your mind, or sometime just nothing? Can you guys give me some suggestion? Thank you!