Cyber, if you are having the same issue, the resolutions as pointed out by Bogdan is simple.
1. Select your voice for Right 1,2,3, or Left
2. Once in the selection panel on the upper right of the screen above the voices list in the blue layer just
select MENU
3. That opens another panel and there select Voice Edit.
Now if you want to alter the Variation volume you use the MIXER/EQ and there are a couple panels in there that can be used for the Variation as a whole "PANEL" or you can also adjust the Voice volume or even change the voices for that Variation. If you press the MIXER/EQ button multiple times it will navigate you to different Panel views. Hope this is what you are looking for.
dom