Support for regional CJK accents

[01wave10]

some text-to speech examples from various websites (find free demos)
also even espeak some CJK vocels/accents sound very strange/strong

that maybe due to accent variations : e.g. Taishanese early wave e-migrating before mainstream (https://en.wikipedia.org/wiki/Cantonese)

ekho's cantonese setting, does reasonable quality can this be used to re-tune the vowels?

Note: tonal language's tone curves in espeak are rather inadequate, it looses a lot of nuance that affect how the words sound and also contributes to the accent

also should improve espeak's voice settings (MAX-MIN pitch)
should it do rather, central pitch(geomean) and relative-ratios between max&min