I've been asked several times how I do my Avatar. And I finally answered it here in this clip from an episode of Ramblings from Unkle Bonehead.
You can get this cross platform app to run on Windows, Mac & Linux and it's very easy to use. Its pretty lightweight and doesnt use hardly any resources.
I dare to say it is the perfect entry way into Vtubing.
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▶️ 3Speak