Some players prefer replacing all vanilla note block sounds with those in custom audio resourcepacks. While NBS already supports custom instruments, there are some inconveniences using this feature (especially when ALL sounds are to be replaced).

The first thing is similar to issue #74, as custom instruments are hard to tell apart when they look nearly all the same.
My suggestion is to allow "replacing" instruments rather than only adding, because when a resourcepack is used, all vanilla sounds become unused, but still occupying the block icons and colors. Clearly this can be achieved by manually replacing all the .ogg files in the Sounds folder, but it's just a little bit annoying to manage.

The second suggestion is also just for convenience. Is it possible to allow automatic batch importing instruments from an audio resourcepack instead of adding/replacing each of them manually?
Resourcepacks have a standard directory tree (and names and descriptions as identifiers), and for players they should be easier to manage as a whole than individual instruments.

To summarize, it would be great if the instrument management tab works just like in-game where you can replace it easily, if that's possible.