48. Peragitur autem a schola et populo alternatim, vel simili modo a cantore
et populo, vel totus a populo vel a schola sola. Adhiberi potest sive antiphona
cum suo psalmo in Graduali romano vel in Graduali simplici exstans, sive
alius cantus, actioni sacræ, diei vel temporis indoli congruus, cuius textus a Conferentia Episcoporum sit approbatus.
Si ad introitum non habetur cantus, antiphona in Missali proposita recitatur
sive a fidelibus, sive ab aliquibus ex ipsis, sive a lectore, sin aliter ab ipso sacerdote, qui potest etiam in modum monitionis initialis (cf. n. 31) eam aptare.
Personally, I suspect that whoever did the U.S. edition may simply not have much regarded the distinction
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