What I have gathered so far is that there needs to be added three more Rom² Karaoke Volumes by NEC Avenue
Rom² Karaoke Volume 3
Rom² Karaoke Volume 4
Rom² Karaoke Volume 5
For the Rom² Karaoke's by Victor Musical Industries.. there needs to be added subtitles where this has not been done so.
Additionally, the items allocated to the Rom² Karaoke by Victor Musical Industries have item numbers that belong to the NEC Avenue Version.
I believe NEC Avenue had item numbers:
HRCD-9101
HRCD-9102
HRCD-9103
HRCD-9104
HRCD-9105
Whilst Victor Musical Industries used:
JCCD-9501
JCCD-9502
JCCD-9503
JCCD-9504
JCCD-9505
Additionally, the Victor Musical Version of Rom² Karaoke Volume 1, uses the release date of the NEC Avenue version, however, I don't know when the Victor version was released, so it could be that they released on the same day. Also, this is the only version where Rom² is written as Rom Rom, for consistency sake, we might have to change that