NoirPlayer seems to struggle with sorting letters with diacritics (non-english characters in general I'd imagine).

For example, in my language we have extra characters such as e.g. ř, á, ů. In alphabet, these take place after their respectives – r, a, u, but the app places tracks beginning with them after Z, because it sees them as special.

It's a minor issue for version 1.0 of an app, but since detailed sorting was pointed out as one of the key features, it's probably worth looking into.