Here is a set of GM and GM2 expression map templates that should do the job. It works for me with my external Roland Fantom XR unit.
Note these do not establish any default channel volume (cc7), channel panning (cc10), reverb (cc91), or chorus (cc93)settings. If you want this, simply add it to the Expression Maps as needed.
The Maps should also work with any VSTi plugin that accepts program changes and has a General MIDI instrument list.
Dorico General MIDI Expression Maps.zip (17 KB)
Example for my Fantom XR:
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In the play tab set up a MIDI Instrument.
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While in the play tab, chose “Play/Expression Maps…” from Dorico’s main menu.
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Click “Import Library” to Import the GM I or GM II expression map attached above and click OK.
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In the play tab, assign each Player/Instrument to your MIDI Instrument. Assign the relevant Expression Map(s) in the “Endpoint Settings” of your MIDI Instrument.
