Hi  I have lots of midi songs  that will be nice if I could "fade out"   how to do that so all tracks fade out at the same time  (easy way)

If you can make volume envelopes in Pro Audio, then put one in the Master Bus.
If you are using the Wavetable synth, I'm not sure if it works, though.
As rule, you should route all your tracks via Master Bus to the soundcard.

I haven't touched PA in twelve years, so maybe I don't remember all the factors included, especially because you don't mention which version you are using. Are we talking about a twenty years old version, from time when VST:s were not even invented??

Posting again -- the forum glitched.....

PA9 (the final version of PA) does not have volume envelopes (AFAIK).  It does support DX but not VST (there is a VST wrapper) but you can't get VSTi no matter what you do.
Although not so easy if your projects have lots of midi tracks, in the Console view you can group the midi sliders, enable Record Automation (red dot in tool bar of console view), and then at the appropriate time drag one of the sliders down.  They will all go down together.

Seems like there should be an easier way....I'll think about it.

PS:  It would be good to identify what product you are using, along with the midi synths and soundcard setup.