You may not have to change anything in the Trinity Musikman, so long as it recognizes the basic GM drum patches. The majority of the Yamaha xg based styles seem to use similar mapping and notes for drum sounds, no matter which drum kit you use. If this is not the case, it might be better to edit the styles themselves so that the proper drum sound plays.
What you will have to do to get the best sounds for your styles is go into the mixer in OMB and reassign the Trinity voices that you prefer to use. The .ins file is basically a compilation of the internal voices of your synth. In other words, the .ins file will activate the sounds in your board when you select those sounds in the OMB mixer, by sending the correct midi commands to the Trinity and telling it which patch and bank numbers to use.
AJ
[This message has been edited by Bluezplayer (edited 12-02-2003).]
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AJ