Hi Timo.
If I understood things clearly, next paid update (Dorico pro 3) will be about fretted instruments. There should be a lot of new things available for those instruments, maybe we will find an instrument editor… Just guessing, though.
I wish I had seen that earlier because I have been going crazy thinking I was entering notes into the wrong octave, or maybe hearing the pitches in the wrong octave (sometimes the low pitches can be deceptive).
I am curious about your “work-around”. The only suggestion I see in the linked thread is to ignore what you hear. That’s not exactly a “work-around”.
My workaround is to choose a trumpet in D instaed a doublebass. Then go to Halion and change the trumpet into a doublebass. And now you must change the expressionmap of the instrument into a doublebass or violoncello or so. Otherwise you hear different artikulations as you´ve written.
If you want to hear the whole range of the solo-doublebass, you can try to use a doublebass, a violoncello and a violin on the same midichannel in Halion. You can limit the section of each instrument in Halion. It works and you can hear a whole Bottesini.