I just put together a smaller case (104HP / 4U) which is a somewhat similar concept (built around a Morphagene instead of Beads) but I made it to be fairly standalone for reasons. You could get a fair bit of fire power with MIDI to CV from an Elektron box to fill in some functionality that you’d otherwise get from modules and wouldn’t then need half the stuff I put in my Morphagene machine.

  • MIDI to CV: CV.OCD for an out of rack solution, Mutant Brain for an in rack solution. If you had a case with a 1U rack, Intellijel 1U MIDI could work. Then you can sequence pitch with what you have (Beads tracks 1v/Oct), and you can also use CC LFOs from your DN or DT, including most crucially random waveform and sample & hold via trig hold mode for LFO. Note that Beads can self modulate with random on most of its parameters though.
  • Some modulation sources: Pam’s Workout (either the new Pro Workout, or the old New Workout which you can probably get vvvv cheap atm since everyone’s upgrading) is hard to beat for functionality: 8 outputs that can be divided/multiplied clocks, or clock synced LFOs/envelopes, all of which you can apply logic to to get more interesting gate sequences/modulation out. It can also generate random melodies, and you can quantize, for eg., a sine wave to a scale to get an arpeggiator. You don’t need attenuation for it since that can be programmed on board (and beads as attenuators on most controls anyway), and it could be clocked by your Elektrons if you have the MIDI to CV (or alternatively directly with MIDI if you have one of the expanders). You might also want an envelope generator (eg. Pip Slope or Make Noise Function).
  • Utilities: I’m not sure if line input to Beads results in line level output (I’d guess not) so you want some way to attenuate the signal back out to your line level gear a stereo attenuator will work, some manufacturers make purpose built “output” modules but it’s basically the same thing. Other things like VCAs / logic / switches / comparators / mixers are good if you want to generate more complex modulation or sequences from what you have, and that’s a whole rabbit hole that’s only worth thinking about if you’re committed to doing modular stuff - it is where the fun stuff is though, and is kinda why you would have a Eurorack system in the first place. If you don’t care about generating crazy modulation out of patches, there are VSTs and iPad apps that sound just as good - you get modular stuff because you want to manipulate voltage to manipulate your things imo.
    For audio mixing, you probably don’t need that in a case unless your case has more than one ‘voice’. A minimal case that’s just for getting Beads going only really has one voice, and I would mix that inside one of your Elektron’s. I can’t remember if you can put either DN or DT input track through a filter, so you might want one of those too. You’ve got a stereo signal path, so need a stereo filter. Shakmat Dual Dagger is v. small and functional for that.

So a super super small case that was just a “Beads machine” could maybe be: Beads + Pam’s + Pip Slope + Dual Dagger + Stereo attenuator/output module, with a CV.OCD on the outside so you can clock it from an Elektron and send over some plocks CV / LFOs etc. You could chip away at some of these things (maybe you don’t reeeeallly need an envelope generator, maybe you can resample into DT and use that filter etc etc), but you pretty quickly get to the point where it no longer makes sense to have a Eurorack case vs just getting Borderlands on your iPad.

It is also a slippery slope into obsession, and I wouldn’t recommend it if you don’t have money to burn. If you bought everything I suggested for a small case you’re probably a grand in the hole already, basically double the price of the Microcosm. You said you had VCV Rack earlier: Clouds (previous version of Beads) is in there, exactly the same code as the module. Use that, see if you’d really get that much more out of it being hardware before you take the plunge.

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