Thank you for the recording of the Lord’s Prayer. Singing it to tune helps in memorization.
As you mentioned, William H. Worrell’s “Coptic sounds” is out of print. When I have time, I may be able to borrow it through an inter-library loan.
But Amazon does carry Thomas O. Lambdin’s “Introduction to Sahidic Coptic” that seems to be a major text for teaching Coptic in academic institutions. I intend to buy that book.
God bless you,
Andrew