EXS 24 Logic Sampler Users Group

Hi,

I need help with the following problem:

I created an alias to the sampler instruments folder
and placed it where the sampler instruments folder
normally resides in the main Logic Pro folder. The
alias points to an external firewire drive where I
installed all the purchased exs24 instruments and
associated samples. 

I can load and play any exs24 instrument existing on
the external drive but when I try to load any of the
instruments installed  and supplied with Logic Pro,
nothing happens.

My question: is this caused by the fact that the alias
for the sampler folder points to the external drive
and the Logic supplied instruments reside on the main
drive and not the external drive? If so, can I move
the Logic supplied instruments to the external drive?
What would the procedure be?

As a side note, I have ExsManager and am wondering if
this can all be solved by running the program to
re-link the instruments and files. But that brings up
another question: can ExsManager be run over more than
one drive at a time, specifically the configuration I
mentioned above?

thanks,

Arthur