An asterisk added to a letter (as A* or G*) indicates that the final cadence is extended to the note above it. These cadences are quite rare for they are only used in two modes: the A* in Mode IV and the G* in Mode VIII. The first (A*) indicates that the cadence ends on la (6) and is extended to ti (7); the second G* indicates that the cadence ends on sol (5) and is extended to la (6).
Quando Antiphona notatur cum A*, potest ad libitum adhiberi Differentia sequens.
When the antiphon is marked “ Fourth Mode A* ” this means that the cadence A* can be used ad libitum instead of cadence A. But on closer examination it becomes clear that this formula A* can never be employed, on any hypothesis, except for the last half of the verse sicut erat and for leading on to the resumption of the antiphon. In every other half verse A must be used.
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