Are the Blue Tubes plugins primarily intended for use with guitars or are they appropriate for vocals and all kinds of things?
Thanks

Some very useful guidance here:
http://blog.cakewalk.com/sonar-x3-exploring-your-new-eqs/
and
http://www.youtube.com/watch?v=8oI4-6MMMy0&feature=youtu.be
 

They're not amp sims or anything if that's what you mean. They cover a large range of applications. Whether or not you like them is a very different question.

They are not intended to be only for guitar. Nor do I believe they were made with guitar only in mind.
 
That said , I have used them on guitar and they go with guitars very well. Love the chorus module. Play with it, lots of sound in there. (Vocals too!)
 
They also have a character that they impart into the track you use them on. I found the Blue Tubes to have more "character" than the other Nomads plugs.
 
HTH