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Re:Show HN: Mandarin Tone Trainer – A ‘Helping Ear’ for Mand... by akavi on Saturday December 21, 2019 @02:17PM (#21852823)
I think it might be trained on female voices.

I'm a guy, and it called all of my tones "3rd tone" when said in my normal voice, but when I spoke in a cartoonishly high falsetto, it gave me perfect marks.

Re:Show HN: Mandarin Tone Trainer – A ‘Helping Ear’ for Mand... by DiogenesKynikos on Saturday December 21, 2019 @02:47PM (#21852994)
I tried your trick, and it worked like a charm! I guess that's how I'll be speaking from now on...