EXS 24 Logic Sampler Users Group

Hello all.  This is my first post to this list.  I'm looking forward to 
checking out what you all have to say.  I have simple question 
that I'm sure lots of you can answer - I seem to be able to create 
16 audio instrument tracks (each running an instance of the 
exs), but can't figure out how to assign additional tracks to 
instruments 17 and up.  Is there a limit to the number of 
instruments I can use?  Is there something tricky I've 
overlooked?

thanks

-morgan