KVR News Filter Function

[Lava]

This should be an easy one. I see that I can filter the KVR News page using specific strings at the end of the URL. For instance, I can filter for Linux-only news using this URL:

http://www.kvraudio.com/?t[]=linux

Great! But what if I want to filter for Linux instruments only? I tried adding a comma with the word instruments, but that didn't work. Also, what if I want to explicitly exclude certain terms (like "sample pack" or "library")?

Thanks!