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Launch HW and in General Settings/Audio outputs make sure the divisions on the left all have their output device set to ‘Hauptwerk VST Link’ and their dedicated channel. (it may be something with AU… on Mac - there’s a pdf describing this in the HW docs) [this step is not important if your HW setup uses a dedicated soundcard, i.e. different from Dorico]
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open General Settings/MIDI ports and make sure ‘Hauptwerk VST Link’ is selected in the column Sequencer Midi In.
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Load the organ you want to use and open Organ Settings/Keyboards… and make sure each manual on the left are set to a unique Midi Channel - Pedal: “Direct input from your…” / MIDI IN port: “any” / MIDI channel: 1 - continue with same settings for 1st, 2nd, 3rd etc. manuals, giving them Midi channels 2,3,4…
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Make sure the HW VST Link is whitelisted and work in Dorico.
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Start Dorico and configure your organ player. Say for an organ of 2 manuals and pedal. Since we cannot yet change Midi channels on staves you have to give the Organist 3 instruments, and adjust their naming. You can use a Bassoon for the pedals and piano or 2-staff organ for each manual. In order to have correct staff labels along the way in Page view, it’s probably better to add this organ as 3 players…
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Go to PLAY mode and under VST instruments on the right, click on Halion Sonic SE and replace it with ‘HauptwerkVSTLink-64bit’ (or the Mac equivalent). Open the organ on the left and verify/change the Midi channels so that they correspond to the setup in HW (Pedal channel 1, 1st manual channel 2… etc.)
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Go to Galley view and enter the score…