On page 49 of Dom Sunol's "Text Book of Gregorian Chant", he (or the translator) says:
"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."
And similarly on page 51, Dom Sunol applies the same logic to 'Eighth Mode G*'
Is this the standard interpretation that the asterisk endings are optional and only appropriate for leading into the antiphon after the psalm?
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