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I have two ebooks enabled for read-aloud, using .smil files and mp3 audio.

Both books work as expected on Thorium and Colibrio Vanilla Readers and both pass the epub check in Sigil.

But when loaded into Ibooks on my Ipad, one of the books shows the read-aloud speaker icon in a black bar at the top of the window, and the read-aloud works perfectly. But the second book does not show the read-aloud speaker icon.

I used the first book as the basis of enabling read-aloud on the second book.

I have checked both ebooks in Sigil and cannot see any missing items that might cause Ibooks not to recognize the 2nd book as read-aloud enabled.

Does anyone, with experience with read-aloud books in Ibooks, have any suggestions where to look for what might be missing in the 2nd book