Well, I made a try with FM8, which have only 2 outputs, and that's work fine.
I can see the two outputs : L&R and I can connect the audio track
It seems it is an issue with ST 2.5 et Addictive Drum with their 16 outputs.
I think the best solution is to make an export of the MIDI file in wave format.
Another surprise whith a MIDI track. The level in the Sample Tank canal 1 is now 0. After two days of session. Don't know why, and don't find the way to reach 90. Try different automations, but when I start playing again, hpp : level = 0. And when I make some changes : presets or connexions, no more sound; I have to click in the outputs master on the outputs choice.
I think I will make a small break with Mixbus3.
On the other hand I can say that I like the sound of my mix in Mixbus. Like the EQ and compressions. I keep it for my final mix and wait for the vers 3.1
So, thanks for your help