Starting 1.0.5, Korean Letters Lite is available on AppStore. Lite version is free, and it contains chapter 1, 2 and 3.
Two improvements in 1.0.5:
All letters are re-recorded for even better sound quality.
Split-sound play when new consonants are introduced - now for all consonants.
If you like the app, please give it a 5 star!
A button is added at the end of the book to go to AppStore page.
Let me know if you have any suggestions.