In Halion it is a bit more complex i think then in Halion Sonic.
In Halion the output is assigned to the zone (which is the basic level of the program structure), but a zone can have multiple busses. (zone editor, manual p.118)
The AUX tab allows you to send the zone to the four global AUX busses and to directly route the zone to one of the plug-in output busses. (AUX 1-4) you can send the zone signal to the global, or, if available, the local AUX busses. You can control the signal level that is sent to the busses with the knobs AUX 1-4.
HALion allows you also to route a zone directly to one of the output busses. In this case, the zone does not pass through the layer, program and slot busses.
The Sample editor plays back the raw samples without processing the synthesis structure. Therefore, its output is not automatically the same as the output of the zone that uses the sample.
For Halion Sonic, with it’s fixed program structure it is a lot easier to do:
in the amplifier subpage you can select the output for each drum instrument or loop slice separately.
(in the manual see p.77.)
Don’t forget to assign multiple outputs in the instrument rack too for both cases.
kind regards,
R.