On processionals, you may want to look at conciliar ordines. Herbert
Schneider of the MGH has just had his definitive study of these
ordines released. You may also want to look at the works of John Gilchrist
who spent a career looking at the Ordinals of Christ and would, no doubt,
have produced an equally magisterial work on this topic had his life not
been ended in such an untimely fashion. Although the A of C do not deal
w/processions per se, they might help you to understaand the rationale
behind any particular processional order.
MFH
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