I adore animals, enjoy shounen-ai and dislike yaoi - so I was sure Voice or Noise would be a great manga that'd top my lists (further convinced by all the positive comments and high ratings). But...come on! What's so good about this? It's just another BL that tries - and fails - to be deep.
You see, I'm the kind of person who expects a manga with plot to have more plot than romance - and this story thoroughly disappointed me by tricking me into thinking it might have a lot of plot, but in the end becoming nothing more than an endless discussion about emotions (be they the couple's romantic feelings towards each other or the fear and isolation Shinchiro feels due to his powers).
As for the so-called 'animal communication'...didn't see much of that, really. Most of the time it was Shinchiro and Narusawa (with occasional interruptions from Narusawa's cat) chatting about how horrible it is to be able to understand animals...with some pesudo-scientific discourse thrown in for good measure.
The plot is slightly confusing, and jumps from place to place erratically. Its pace is too jarring considering how Yanjin Emimaru seems to be going for a slice-of-life flavour. (I read the official version, so it could hardly be due to an error in translation) Also, this is one of those stories where every single thing that happens makes the protagonists realize their love for each other 🤨
One good thing is that, like pleochroic mentioned in her comment, Narusawa kept his emotions in check and didn't come onto Shinchiro in the first two books (I wasn't interested enough to read volume 3, so I never got to the point where they actually did anything)
If you want a nice manga on being able to talk to animals, go read Animal Sense and Helen Esp - which have simple, unpretentious characters who don't try to draw parallels between their supernatural abilities and complicated scientific theorems just so the story looks smarter than it actually is. Or revisit your childhood by watching Doctor Dolittle again.
For those who like a smart plot in their BL, I recommend trying out Concrete Garden.
But I won't rate Voice or Noise because...well...at least the mangaka tried to construct an original plot, which is certainly more than can be said of most BL authors.