Need help with unknown (for base of Dorico) instrument and connect with VST plug-in

Good afternoon, please tell me what I can do in my situation.
In the orchestral score I create a part for Ukrainian national instrument Bandura. In the list by default there is no such instrument (of course). I used a piano. But when I plug in the Bandura library, the instrument library reads midi notes which are prescribed for switches. The library (of the instrument) is quite old and it is still very difficult to change the transposition of the switches internally. It doesn’t work. In Finale this was much easier to solve.
As a result, the situation looks like this: notes in the large octave should be played, but fall into the key zone and switch the library to effects. There is no way to transpose the instrument, or I don’t know how to do it.

So, the problems:

  1. It is impossible to create an empty instrument and give it the properties you want.
  2. When selecting a standard instrument, it is impossible to improvise with the instrument’s settings and settings in order to adjust it to the library.
    Please, advise, please.

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Welcome to the forum, @pacdenis

The first thing I would try is to see which Expression Map has been assigned to your custom instrument. The Default setting might be the first to try, but since I do not know the range of the Bandura, I cannot say whether that would work or whether you might have to create your own expression map to limit the sounding range to what is customary for the instrument so that outside pitches/keyswitches are at least screened off if not set to trigger the keyswitches in the manual for your instrument.

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From the point of view of playback, it doesn’t matter what instrument type you choose: Dorico will of course have its own default idea about what sound it should load (and consequently what expression map it should use), but you can easily change this in Play mode. Having created your piano and renamed it in Setup mode so that it is labeled as Bandura in the score, go to Play mode and load the VST that provides the bandura sounds you want to use in the VST and MIDI tab. Then select the Bandura track in the track overview, and switch to the Track Inspector tab. Now choose the VST you added as the output device for that track. Finally, click the little cog button to open the Endpoint Setup dialog, and make sure that an appropriate expression map is chosen for the channel where your bandura sounds are loaded. For the time being, ensuring the Default expression map should be enough to make sure that Dorico isn’t sending key switches and MIDI controllers that don’t apply to the samples you’re using.

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Thanks for the good advice. But what about the situation where I need to display those notes on the bass notebook that are already out of the library’s range, but they should play?

Thanks for your recommendation, I did all that. But the situation is somewhat different. I chose a piano for Bandura. But the piano does not shift octaves, I would like to do exactly that. move the binding to the midi an octave lower or higher for example. Is it possible?

Yes, you can specify in an expression map a transposition in either direction by one or more octaves.

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If you have interes for this instrument that add to list of Instruments of Dorico, please link:
Bandura - Wikipedia.