The phrase "humorous voice" is correct and usable in written English.
You can use it when you want to convey that someone is speaking in a way that is jokingly or whimsically lighthearted. For example, "John was talking in a humorous voice about his weekend plans."
This is not a biography or an analysis, but simply the warm, wise and surprisingly humorous voice of Mr. Jayer speaking through the prism of Mr. Rigaux.
For I realised it wasn't only the plot and characters of 101 Dalmatians which so entranced me, it was the author's beguiling, humorous voice.
Then, in a humorous voice that seemed proud and disgusted in equal measure, he added, "We're a small organization, but when we lay off three people it's bigger news here than when U.S. Steel lays off 20,000".
Andrew Smee of Rock, Paper, Shotgun thought Gangstas in Space was the better of the final two packs, and praised the game's humorous voice acting as "the best since... Psychonauts".
He tried to find something easier, so he "dropped the voice down", and developed it into a more versatile and humorous voice during the second and third season of the half-hour show.
Also, while booksellers or the Library of Congress may classify both these books as humor, I'd say they're both nonfiction books full of information that are told in a humorous voice.
She ended up reconstructing several worlds — eight hundred recipes, and a trove of folk tales, proverbs, stories, poetry, and local history — and, when she finally sat down to write, it was in a clear, humorous, elegant voice that she hadn't known she had, a voice that could keep you up, nights, reading.
This moral is not new, nor is Grass's method of a crabwise narrative, revolving facts and incidents in a colloquial, sometimes humorous, somehow harried voice.
A thing of lightness and beauty; a precious thing that holds the wise, humorous and fragile voice of a very precious member of our community of writers.
Kramer pointed out that the singer took a great deal of his mocking, critical voice — "humorous impurity," he called it — from the very movement that he was supposed to have renounced.
"But I find that voice very humorous.
