how to lower all mixer faders at the same time?

Dan Quiet wrote: thanks a lot for your reply @ryclark. are you sure it's not possible? For example on pro tools this feature is -essential- for mixing. I can't work in music production with audition if this feature is not avaiable. Lowering the master fader is -absolutely forbidden- in music schools for technical reasons. I hope Adobe will fix this big issue please.

There's nothing to fix. If you want to lower the level of a group of faders, then send all those channels you require to drop the level of to a group, and lower the group fader; this has exactly the effect you require without touching the master fader at all.