This may be old hat to serious MIDI types, but I thought I would outline the steps for using Logic Pro (and all its sample libraries) as a MIDI Instrument with Dorico. (MacOS only.)
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In MacOS’s Audio Midi Setup.app, show the MIDI Studio window. You should see a device called “IAC Driver”. This is Apple’s built-in device for piping MIDI from one app to another.
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Double-click on the the IAC Driver. You’ll get a window with a checkbox “Device is online”. Tick the box.
You’ll need to restart Dorico now. -
In Logic, create a Software instrument. You now need to set the MIDI input for this. You can find loads of webpages describing “how to specify midi input in Logic”, but the steps are:
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Open Logic’s MIDI Environment window. Command 0. You may need to turn on MIDI in Preferences > Advanced.
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In the Enviroment window, click on New > Physical Input. You’ll see a graphic image of the IAC device, with little arrows for output points. Drag the top output point to the MIDI instrument strip.
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In Dorico’s Play mode, Create a new MIDI Instrument. Select “IAC Driver Bus 1”, as you would select a VST. Then select your MIDI Instrument in your Player, as you would a VST.
Bingo! Well, it’s working with one instrument on channel 1; further investigation for how to do multiple instruments may be needed. Let me know how you get on: I’ll supply screenshots if this isn’t clear.