Developing Perceptual Abilities in Altered States of Consciousness The Basics of Hemi-Sync The Gateway Experience Japanese Edition Hemi-Sync The Gateway Experience Wave Ⅰ - Discovery Wave Ⅱ - Threshold Wave Ⅲ - Freedom Wave Ⅳ - Adventure Wave Ⅴ - Exploring Wave Ⅵ - Odyssey Set of 6 volumes 3 CDs each Instruction manual included I've decided to sell these because I gave up on them. They are in good condition because they haven't been used much, but the cases have minor scratches from aging. Volumes 2-6 are unopened. To prevent content replacement, returns are not accepted after purchase.