If you do not recieve your confirmation email within a few hours, please email haloutau@gmail.com with your username for manual validation. Your account should be activated within 24 hours.
You may also reach out via any other listed contact on Admin Halo's about page: https://utaforum.net/members/halo.194/#about
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For OpenUtau specifically, you can customize many of the settings from the settings gear in the Singer window.
These settings get saved to character.yaml, which can have more options (such as setting the voicebank name in multiple languages). Full specifications are available here.