Is it possible to load mutiple instances of a VSTi?
Yes. Is mini-Erhu imported as an insert mapping, or does it have multiple in/out mappings? If it’s an insert, then placing the mapping on each track should be enough. If it’s a global plugin, then you need to create additional sets of mappings for each instance you want (#2, #3 etc.). Easiest way to do this is to import the plugin again.
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