There is a good chance that this approach will become redundant with Metasounds in UE5. You can build your own custom nodes already, although it is a bit hacky in early access, but you can see all of the classes are ready for implementation in the future to do it properly. Native Metasounds seems to do do most things and the ability to write custom nodes allows anything “special” to be done without having to write tons of code. Also it will provide better integration into the game engine (through C++ or Blueprints). Something to look forward to in 2022 
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