Logic isn't capable of playing more than one virtual instrument in realtime
(rather lame that this is still not implemented, if you ask me - quite some
other hosts allready allow for this).
Workaround for some situations:
- Insert an I/O plugin on the desired EXS objects
- Assign *any* ins and outs for the plugin
- Bypass the plugin
- Press play (won't work elsewise, which is the drawback)
Regards,
Sascha