Those looking for more direct instructions in the tantric traditions can benefit from the audio cassette Yoga Nidra, Tantric Meditation and Visualization by Dr. John Mumford and Jasmine Riddle. Dr. Mumford is a renown expert in the Eastern arts and experienced instructor into their mysteries. Yoga Nidra is a developmental technique that allows you to progress into a refined state of psychic sleep.  The twin elements that tantric yoga utilizes are body sensation and visualization.  Dr. Mumford and Jasmine Riddle guide you through developmental stages by moving your consciousness through different parts of your body.  The visualization component allows you to get in touch with your psychic centers, or charkas.  As an example, Riddle guides us through sensational attunement in each hand by focusing individually on each finger.  We move through the tip, the nail, the first joint followed by the knuckle, the second joint followed by the knuckle, the third joint followed by the knuckle and end with the pad on the palm of your hand.    After leading you through your body's consciousness centers with sensational awareness, the visualizations then move on towards differing senses.  Light, heat, cold and joy are felt, followed by chakra exercises that move from base to crown and back again.  Accompanied by meditative music, Jasmine Riddle's soothing voice gives a relaxing feel that will accompany you along your journey.  Ultimately, you can reach a state of conscious movement through body sensations using visualization exercises that culminate towards an enlightened perspective.