Well I don't know about the audio the oneone1 games definetly never had spectacular audio(meaning lots of voice acting unlike other h-games that do voice acting very well and where almost every line has a distinctive audio), I mostly force myself to play them 'cause of the sprite art, but after the 2nd rape scene, I normally quit the game and remove it from my hdd.
Honestly, I never lasted more than 2 scenes in any of their games, before I was about to vomit...also means I never completed any of their games...so maybe I am not the best critic when it comes to their audio files...I don't know what makes me quit their games it must be a combination of the three, their distinctive art and writing style combined with the average audio...I guess!
Sorry for my harsh critic to whoever likes their art, I still do like the funny stuff they do with the sprites, that's why I normally give the games a shot, but apart from the sprites their stuff always bores or disgusts me at some point.