It seems like there is no way to create custom instrument

So if I want something like a erhu, I probably have to choose something like a violin and change it’s name and assign the correct sampler instrument. Is that correct?

That is correct.

Well, you can, by editing the proper xml files manually, but you probably don’t want to go down that path.

Will custom instruments be possible in Dorico 4.0?

I’m afraid not, no, though we know it’s important and it’s something we plan to add as soon as possible.

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