Orca calls are in fact very complex and acoustically rich, suggesting that information could be imbedded within them in ways that are imperceptible to human ears, just as the peculiar sounds of a computer modem, heard over a phone, sound like mere repetitive screeches but are, in fact, carrying signals rich with information. You just need the right processor to translate it all.
Orca language my not be entirely perceivable by humans consider analogy if a modem that requires the right processor