ἐίτε ἐν βαθυῷ.  This is understood by Balsamon and Zonaras to include Presbyters, Deacons, and sub-deacons; while the ministry conferred without imposition of hands refers to Readers, Singers, Sacristans, and the like.  Alexius Aristenus ranks Singers and Readers with the higher orders, and understands by the lower, keepers of the sacred vessels, candle-lighters, and chancel door keepers.  The Ben. note inclines to the latter view on the ground that the word “remain” indicates a category where there was no advance to a higher grade, as was the case with Readers and Singers.