So i am wondering and am confused by the Routing options.
I wonder if i can route one track of the DT2 to the main output L+R, send this through an external hardwear Fx and then go back int through the Line In L+R while listening-Routing the whole Project-The whole mix-The Summ, through Earphones?
Is what i am imagining possible or am i overseeing something that might be „hazardous“ for the DT?
Looking at the Digitakt II manual it does seem like this could be possible. If you can change the routing of your tracks only to Main Out and not headphones, and route the external inputs to headphones only (you don’t want the external audio going back to the main out, this might cause terrible feedback) , then you can try what you suggested. You might need to adjust your internal fx routing as well.
But do you have another device (e.g. audio mixer, audio interface) where you could take the output of the DT2, into your effects and then into a mixer/interface and listen to the output that way? Seems simpler, but you may be trying to avoid the use of such additional devices…
Headphones out send the same signal as MAIN.
Hmm.
Trying to follow.
By plural amount you mean in general or really routing ALL tracks?
The solution with the mixer you are right that i am trying to avoid this.
In my imagination i listen to the whole mixdown through headphones, play around with the one Track that is routed through an external hardwear , lets take a guitar fx pedal as example, and if i like the result then i could Record it as a loop and have it available inside the project.
Why is that? I mean i will only be hearing the signal afer processing and not the signal dry+ wet through the Ext gear combined. So how would the Feedback happen i am trying to understand? 
Ah so you mean its hardwired and i cant change this i suppose
Yes.
You can avoid feedback if you hard pan your tracks and inputs in a opposite way.
Exemple with an Analog Drive distortion, Digitone, same principle.
Bassline panned right > AD > Input left (panned left + delay)
Other sounds panned left.
Listen to left output.
Delay can be panned, not chorus nor reverb.
In stereo, I found a different trick : don’t send Inputs LR to MAIN. Send Inputs to Delay : that way you can insert fx in the delay loop without annoying feedback…
Ok that i need to re-read later when at home cause i get confused imagining it right now 
But in short, what i wanted to achieve with a stereo signal from a single track going out and in the DT is basically not possible am i right?
Not possible with analog outputs, but I think it is possible with USB; I didn’t try. You need an USB Host like a smartphone or a computer. @Humanprogram may shime in…
Possible, for sure.
Would you want to do it? I doubt it.
Of course i would like to do it. This is why i am asking if its possible.
Why would i not want to?
You mean with Overbridge?
Btw i really hope this comes soon-ish
Please, do not loop Mains/Headphones back into External Ins of Digitakt.
It’s not designed to be used in that way.
No. USB Audio and MIDI Class Compliant. Ipad apps for example.
And this will give me individual tracks output ability?
Can you name an App That comes into your mind?
Yes, it’s the USB Out item in the Audio Routing Menu, similar implementation to Syntakt. You can pick 1 track L/R or two mono tracks to send over USB, then bring back in. Haven’t worked with this and a computer, but it allows an iPad effects loop.
The details from Syntakt, similar menu:
you can route one track to usb, I’ve done it.
I don’t remember what menus you need to go, but essentially, you can route one track to usb (for example to ipad/iphone AUM app, that hosts some sort of effect, I tried eventides distortion plugin), and sample effected audio back to DT2.
It’s called a feedback loop. Audio feedback loops are created when an audio signal is sent from an output and then routed back into it’s own inputs, if the output is not first removed from the main mix. The same sound keeps going around in circles on top of itself and it creates feedback.
This is traditionally not a good thing, although in experimental music / sound design, someone might experiment with the sound you get from it while utilizing limiters and noise gates to attempt to control the feedback and prevent damage to ears and speakers.
This is similar to how microphones and guitars create feedback when improperly positioned relative to an amplifier in live music situations.
You can google audio feedback loop for a better explanation if that doesn’t make sense. Basically, it’s bad.
That sounds awesome!
Is the Audio Back into the DT2 also via Usb? So you send it out via Usb and then route the Audio from the Ipad back via USB and can then record it into the DT?
Or am i missing something here?
Sweet!!!
Will try it out later.
I bought an iPad Mini Gen5 to use as an "external polysynth“. but now i am even happier that this is possible.
I know what a feedback loop is. But thanks nonetheless.
My question was based of my understanding of using discrete channels, not overlapping ones.
But my understanding was wrong as it seems cause i later gor all the answers that its not possible (the way i wanted to try, i.e Routing one Track to the L+R out and then Recording the Processed signal using the Line In L+R and monitoring the whole thing via Headphones. I thought at first that all channels can be used independently