Certain special characters are not displaying correctly from embeded fonts

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I am writing a music theory ebook which heavily uses an embedded font called "Opus Text". This font contains characters for music symbols and notation. Some of the characters display correctly in the Readium ebook viewer. For example the lower case b is the musical flat sign. This character displays as a flat sign everywhere it is needed. The same is true of the # sign which is the sharp symbol.

However, the capital X character is the musical symbol for a double sharp. This character, however, never displays correctly according to the embedded font face. It is always shown as a capital X rather than the double sharp sign. This is also true of the § character which should be the musical symbol for a natural note.

A number of characters display correctly and a number of other characters display incorrectly. Is there some reason why certain characters are read in from the font and displayed correctly and others are not?

Is there anything I might try to make the entire character set from the font display in readium?

Thanks,
--christopher

They were not developed well-enough for writing music ebook. I guess there should be software specially developed for these purposes. Once have assignment at http://www.buythesisonline.org on music and have to admit music materials writing software is not paid as much attention.

I did a couple of quick tests and it appears that the font is flawed.  Does your example EPUB work in iBooks or some other EPUB reader? When I open the font in the OSX Font Book.app the symbols (e.g. Capital X) don't display correctly either.

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