I just tried entering some simple GM Expression Maps into Dorico.
Here’s the Expression Map library that can be imported.
GMStrings.zip (1.39 KB)
While these will not implement the technique changes with Sonic SE in GM Mode (Found in SE’s Options Tab) through Dorico (Program Change events aren’t being sent when Dorico Plays live to a plugin), they DO seem to export the proper program changes when using Dorico’s Export as MIDI. The catch is that some SMF players can’t change programs fast enough to play such renderings back without editing the SMF file and sliding the program changes a few ticks sooner.
In this example I loaded a score, imported the Expression Maps above, and set everything but the strings to use the "Default’ expression map. I chose My GM Ensemble Strings Map for all my string parts and set Expression Maps to send program changes for Pizzicato and Tremolo techniques. I went ahead and added solo strings to the map library as well. Note that it’s a good idea to skip channel 10 for SMF files (unless it’s a drum kit), as many SMF players just reject program changes over channel 10 (Channel 10 also skipped in the flow/player tabs of my score).
This will at least make it easy to import such MIDI renderings into other DAWs, and still have a place marker for the technique’s offered in the GM1 instrument list.