Well...it's not exactly an SH-101 soundwise...the filter is very different, since the 101 had a "sort-of" 4-pole LPF, and the Atlantis is more of a "proper" 4-pole, albeit a multimode, plus it has that "boost" circuit. I'm actually shocked and amazed to say this...but if the SH-101 sound is what you need, that new Behringer clone actually nails the sound. I've been checking some of the NAMM videos of that, and it sounds exactly as I recall mine sounding...that same little bit of distortion in the suboctaves, the odd filter response nonlinearities as you open up either the cutoff or resonance, and so on. Plus it has the FM mod that a bunch of people added, and a much better sequencer. If that's the sound that appeals to you, it might make more sense to go there...plus you get a sequencer (with memories), arpeggiator, keyboard controller, and external main clock as well. And it's cheaper, and frees up 40 hp in the process.
Yeah...me, recommending Behringer. Asteroid impact in 5... 4... 3.........
But the other reason for doing that is a very different thing from Intellijel: the Rainmaker. Common to the Berlin school, ambient (especially ambient dub), IDM, and generative is the need for a versatile and complex delay. The Rainmaker isn't small...but it has the power and flexibility needed to straddle all of those genres. At 36 hp, if you removed the Atlantis for one of the Behringer 101 clones, you'd then regain 4 hp from the Atlantis being removed and replaced.
No, continue using the Digitakt...but considering the 101 idea, here's a plan of how that can work:
Digitakt: master sequencer and master clock. Drives Hexinverter Mutant Brain to derive 4 CV/gate pairs for modular + clock out.
Pam's: trigger sequences, drive from Digitakt clock via Mutant Brain.
101: Digitakt clock (via Mutant Brain) drives 101 clock via EXT CLK IN or Pam's drives the same with a trigger pattern. Manually play kybd for live arpeggiation or bring in extra sequencer line for live counterpoint against Digitakt's patterns.
This way, everything locks up to the same clock source, with an interesting option on how to clock/step that manual arpeggiator and/or extra monosynth line.