And so saying, she walked hastily out of the room, leaving awkward feelings to more than one, but exciting small compassion in any except Fanny, who had been a quiet auditor of the whole, and who could not think of her as under the agitations of jealousy without great pity.
There are no more uses of "auditor" in the book.
Show samples from other sources
His lips work wordlessly, without cease, as if speaking to some helpless auditor lodged within his breast.
William Styron -- Sophie’s Choice
You know the auditor told you it was a bad business.