AeCart

You could combine these in lots of ways. A starting place might be to send midi from the Deluge into the digitakt and from the digitakt to the digitone. You can set the digitone to listen for midi channels 9,10,11 and 12 for it's four voices and use midi channels 1-8 for the digitakt's 8 voices. Another variation that I like to use is to do all my digitakt voices on one midi channel. Just scroll all the way down to the bottom notes of the Deluge midi, unselect scale so you have a chromatic situation, and you have an automatic kit ready sending to the first 8 voices on the Digitakt. In that case I would use midi channel 1 for digitakt, and then 2,3,4 and 5 for the four digitone voices respectively.

as far as audio goes, I would put each instrument into stereo channels of a mixer. Or if you don't have a mixer, you could just run them in stereo deluge >digitakt>digitone and then into two powered PA speakers. A mixer would be way easier.

Have fun.

I'm crossing the streams this evening. Deluge midi slaved to OP-1, audio all routed through Deluge as well as all external sounds via the mic on the OP-1. Fun times.