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

Both song and pattern edit modes have a CHANNEL ASSIGN page.
This page has a Dest. parameter. [Destination]
Your choices are: int, ext, both.
These can be set on a track by track basis.

REMINDER:
Each track can have midi data on 16 midi channels.

SO:
If you want tracks 1 --> 6 to play the E-Mu synth engine alone and
not the external gear, set those tracks to int.

If you want tracks 7 --> 15 to play external gear alone, set those
tracks to ext.

If you want track 16 data to go to both, select both.

Hope this helps:
Dr. Steve