Hi, welcome to the forum.
The .sib file that has all the instrument definitions with the tilde ("~") is for sampling the sounds and can be downloaded from here. Once there, click the "download" button to get the library information package that has the .sib file and sound set file.
The custom Ensemble that is in the image you attached is what you'll want to use instruments from when actually writing music.
Let me know if you have any other questions.
Hugh
The .sib file that has all the instrument definitions with the tilde ("~") is for sampling the sounds and can be downloaded from here. Once there, click the "download" button to get the library information package that has the .sib file and sound set file.
The custom Ensemble that is in the image you attached is what you'll want to use instruments from when actually writing music.
Let me know if you have any other questions.
Hugh