Program-level feedback in the insert routing configuration:

1) With series routing, the output of B feeds back into A.  Inserts in ‘mid’ position included in feedback loop.  All other insert positions excluded.

2) With parallel routing, outputs of each algo cross-feed into the other (A->B, and B->A).  Inserts in ‘parallel’ position excluded from feedback loop.  Inserts in all other positions included.