EXS 24 Logic Sampler Users Group

Dear experts ;O)

Is there any possibility to make program changes with EXS instruments? What
I need is: I have a track in Logic - e.g. Strings - and want to switch
between pizz and arco without changing tracks (it's very unpractical having
two or more different tracks for one instrument). I know how to make program
changes with other instruments (e.g. GIGA-Studio) but can't find a solution,
how to make this with EXS (program changes do not work, channel changes do
not help.).

Help me please!

Thanks!
Iwan