http://www.internationaleap.org/materials.php
The Rainbow Passage contains ALL of the sounds English uses (consonants/vowels/dipthongs, blended consonants); you name it, apparently it is there! I have uploaded a .pdf of the text an audio of me reading the text as a guide. My advice is to print off the text and then practise repeating after my vox guide, a phrase or two at the time!
Once you have mastered it, why not then upload an mp3 of your efforts so that we can have several different pronunciation models
