Back to the original question of making a smooth sounding transition through the passagio, chest to head voice... I second Escamillo on lifting the soft palate (the top back of the mouth). When I started lessons I learned to make that transition, but had to change a habit of "belting" in the chest voice to singing the way I do in the head voice, bringing it down in to the range of the chest voice. Lift the soft palate, sing your highest note, then a smooth scale down to your lowest note. Practice the placement and eventually you will find that the sound in the lower part of your range will blend more smoothly into the higher part. I still think you should find a GOOD voice teacher who will work one-on-one with you. If you can't get one in your area, try personal lessons from my teacher via cassette tape through the mail. She will listen to you sing and then record her feedback, recommendations, exercises, etc., and send the tape back to you. You can email to her at Szdngorder@aol.com. Her web page is temporarily at:Suzanne Gorder.