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Using tENS for tVNS is equialent to testing medicine with unknown dosage.
No, it is only possible to create and publish your own Tones with the Research Edition, but you can not load Tones from the Vagus Tone Store.
It is a 70:30 split of net Tone sales in favour of you, the Tone developer.
Once you submit your Tone it will be reviewed and help will be provided for publication.