Have just ordered a copy! But I expect I won't see it for several weeks. My Latin also isn't good enough to make much sense of the preface.

Any other substantive changes from the first edition that you notice, aside from the two mentioned in the very first post?

Note to admin: please delete if this contravenes copyright or anything.

@Vilyanor Looking at the preface, I see the following changes, deletions or additions:

Subsection: Invitatoria
After the paragraph starting "Antiphona ad invitatorium iuxta..." has been added:

Si antiphona ad invitatorium terminatur a verbis Venite adoremus, haec verba tantum repetere licet post unamquamque stropham, dummodo sibi consonent partes melodiae. Sed post Gloria Patri, semper repeti debet antiphona integra.

The paragraph "Toni vero, vel pro antiphona..." has been deleted

There are no changes under subsections "Hymni", "Responsoria" or "Proprium monasticum".

The section heading "De aliquibus regulis in cantu servandis" has been renamed to De aliquibus principibus musicalibus huius editionis.

The subheadings have been deleted from this section. The subsection previously entitled "I. De neumis" remains mostly intact, with the following changes.

• The list item beginning "numeris 9 et 11" has been changed to:
  

  - numeris 9 et 11, neumae initio debiles, quarum prima notula praetenuis est;

• The list item beginning "numero 16, transcriptio" has been changed to:
  

  - numero 16, transcriptio usu recepta trigoni, cuius trinae notulae ex seipsis tenues sunt.

• The paragraph "Insuper, figurae plures" now reads as:
  

  Insuper, figurae plures, quae in primitivis notationibus vim habere in ordine melodiae (v.g. virga simplex vel oriscus extremus...) visae sunt causas non amplius habent cur exprimantur. Pro illis enim satis loquitur situs in lineolis hodiernae notationis.

Subsections "II. Quomodo neumae legantur: and "III. Quantum valeant notulae diversae" have been deleted in full.

The text resumes with the subsection previously entitled "De repercussione et coniunctione vocalium", starting at the paragraph "E notatione...". The second half of this paragraph, from "unde unaquaeque..." has been deleted.

The section continues up to and including the diagram of barlines. The example that followed has been deleted, and the preface concludes with the following two paragraphs:

Excellentia liturgica cantilenae gregorianae ex perfecta adaequatione melodiae cum textum sacrum defluit. Propterera qui cantando dictioni latinae sedulam dat operam, ipso facto iam potitur requisitis plurimus ad cantilenam gregorianam recte exsequendam.

Haec latina dictio versificatis hymnis praebet specificam proprietam. In quibusdam ex iis syllabarum quantitas latinarum, iuxta consuetudinem, longa aut brevis, ad rhythmi integritatem requiritur. In casibus sapphicorum hymnorum, cum melodia non clare significat syballam longam esse, prope notam separatam additur punctum, quod huic defectu satisfacit.