10. it may be—that is, perhaps, speaking by conjecture. "It may chance" (1Co 15:37).
so many—as may be enumerated by investigators of such matters. Compare "so much," used generally for a definite number left undefined (Ac 5:8; also 2Sa 12:8).
kinds of voices—kinds of articulate speech.
without signification—without articulate voice (that is, distinct meaning). None is without its own voice, or mode of speech, distinct from the rest.