Yes, I would also like to know about volume control. I've downloaded the trial version of PD 10, and was thinking of buying it when I realized the volume controls seem to be too basic for me to use.
When dropping music volume during a voiceover, there is no decibel reference to see if my points are actually level.
It looks like I have to manually line the timeline marker with each audio keyframe and type in the volume number in the Audio Room.
If I do that, and then add another keyframe next to it, the volume level changes with the new keyframe, so I have to enter the same value again to keep it level with the previous keyframe. It looks like it would be extremely tedious if I had to adjust the volume a number of times.
This is aggravating because PowerDirector looked so promising as an alternative for me to Premiere Pro.