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Are you considering developing a voice extension based on TuneLab?
If so, please review this module: Link
If you have further questions, feel free to leave a comment. However, please note that future extension interfaces may undergo changes, so we have not written detailed documentation at this time. If you need references, you can use dnSpy to reverse-engineer the currently available extensions. Most of them are written in C# (at least the entry points are). Due to certain reasons, the extensions are not fully open-source at the moment.