The book
Print, Kindle, and Audible, narrated by me. The QR codes in the paperback still open the listening examples on this site.
The book is the written version of how I listen. If you scanned a code in class or in the paperback, you are in the right place. Those players have not moved.
If the examples show you a gap, Second Ears is the next step. I will hear your mix, not a textbook clip.
Every printed QR code still plays at its original address. The full list is here if you want to walk them in order.