Emu XL-7 & MP-7 User's Group

I've just started using the XL7 to control my other gear.  However, 
when I set a track to be external, the setting doesn't stick.  I am 
using Pattern Edit, then routing each channel 09A - 016 to external.  
However, the settings continually get reset to internal.  It seems 
that when I change an earlier channel to internal for example (01A - 
INT) than all subsequent channels/tracks get set to internal.
Anyone any ideas?
Thanks,
grimley