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it may depend on the pretrain used, go take a look at https://discord.com/channels/1159260121998827560/1235952130855010365

most of them are optimized for English

this is a recommended one for Asian languages or singing vocals https://discord.com/channels/1159260121998827560/1254087305665183774

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the latest version of Applio is much better than your Mangio

get it here:

https://docs.aihub.gg/rvc/local/applio/