Adverbs for senses

Hello. I've encountered a problem trying to succinctly and consistently describe a gas leak that could be seen, heard, and smelled. Here's what I have come up with so far, with problematic words bolded:

"I visually, auditorily, and olfactorily observed the component leaking vapor."

"I observed the component visibly, audibly, and olfactoribly leaking vapor."

I want to keep the different adverb forms consistent, so I don't think olfactorily_ would work next to _visibly_, for instance. Seems to me that, while _aurally might work in the first sentence as pertaining to the sense of hearing, the connotation of aurally is that it relates to the sensory organ more than the sense (like optically vs visually).

So A) how do I spell the adjective of auditory_, because I've seen different things online, B) can I use _audially there instead, or is that a made-up word, and C) is olfactoribly legitimate, or is there a legitimate alternative that fits?

Seems like I need to subscribe to OED online, but I haven't; so I apologize for not consulting that before I ask y'all.