A while ago a reader wrote to me because the clef on the ferial hymn in volumes 3 and 4 of the Antiphonarium pro Liturgia Horarum available for download here at Dominican Liturgy on the left side bar is almost always on the wrong line.
I was unable to fix this because of glitch in the Meinrad font I use to set the music. The font specialist at St. Meinrad's was kind enough to fix the issue. So I have now corrected this mistake. The new PDFs for volumes 3 and 4 can now be downloaded. Gratias Deo!