-Jbt:
The baseline for Kanji TrueType fonts is adjusted by the corresponding jfm file(Property Sheets->[JFont2]). This parameter has a value ON or OFF (default: ON).
If the value is OFF or the ratio height:depth of the default character type of the jfm file equals that of min10.tfm or jis.tfm, the baseline of the TrueType font coincides with the baseline in TeX.