"Simphonos" apparently means "in one voice," or "making a sound all together."
"Animnisomem" ("-men?") souds like a derivative from "anamnesis" ("recollection" or "rememberance") (see, my medical background shows!)
"Tovaptiz" may be a derivative of "baptismo" (Baptism; Greeks can pronounce their "betas" as "v," like in "presviteros," "vasileos").
So, it's something like, "come people, let's all sing in one voice, remembering Christ, as we all have been baptized; all of us, who have been cleansed."