My nix ox sounds seem loud and clear when I have headphones on. Maybe check your audio settings? Then again, I've seen at least one other person with this comment, so maybe its a personal preference thing.
It makes a similar sound to uncorking a bottle at times
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Well, it's a huge spider-type insect with a heavy body, bags, chair, metal added to the legs and a heavy person riding it. It's not a regular insect.
Besides, all other sounds it makes are OK, like jumping and landing (try it); it sounds exactly the same (as loud as) as the rest of the mounts, even when insects (based on your comment) are not supposed to make loud noises when jumping and landing.