Digitone + TR8-s + Focusrite interface in Logic

Hello,
I am a bit of a baby user trying to do something that is a bit complicated :
I want on logic to have my 4 digitone tracks as midi and audio (that I can play witha midi kyboard plug into my mac)
AND
TR8-S with individual tracks on logic

And everything going out in audio with my audio interface.

I am having trouble because when I create an instrumenttrack with overbridgenothing comes out in my interface. If I create audio tracks with digitone as input it works, but then logic would not accept having an other input (The tr8-s).

oulalalala