Voices volume level when using a playlist

[ChrisH]

Hi Guys

If I'm playing songs from a playlist that has been created from a MDF file I find that sometimes the default voice when it starts (after the intro) has a really low volume level  and the sometime after switching in a variation level can be either normal or again very low level ...  if you go to a 2nd and subsequent song in the playlist the style and intro are always correct but again as you change a variation the OTS will also change the voice (as it's supposed to) but again it can often have too low a level or even too high!  What is the best way to manually control the voice levels on the fly or is it better to check your 4 OTS levels in the mixer before beginning???  I tried assigning Volume and KeyBoard Volume to the Live knobs but it doesn't seem to make a lot of difference???   What do you do if a voice level is low during playing when you activate a variation???