More tested devices that haven’t been mentioned yet in this thread:
- Arturia MicroLab
- Arturia MiniLab 2
- Arturia MiniLab 3
- Novation Launch Control XL
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Tesseract Modular - Sweet Sixteen mk II
Functioning correctly ( Usb B to Usb C adapter used )
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I have the AKAI MIDIMIX working through my MRCC MIDI router
The new Erae 2 is a bit of a dream combo with the MM !
not only is midi working, but 24 (!) cv outputs, and flexible layouts (notes, faders etc), and even a looper (for cv and midi)
I think my requirement for expanders for sliders/buttons has just vanished
(sorry dan , only jk 
)
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A rather old Evolution UC-33 is working perfectly.
ESI MidiMate eX
used the usb-c → usb-a adapter supplied with 4ms MM
Sequentix Cirklon v2 - working (USB device port)
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Befaco Voltage Controlled Midi Controller works well.
Gives you 8 faders, 10 buttons, 10 CV Gates and 12 CV Controls, a great hack while waiting for expanders.
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Intuitive Instruments Exquis (link: Exquis - Expressive music at your fingertips), direct via USB C cable.
Linnstrument 200 (link: Linnstrument)
(sorry - I do not seem to be able to edit my original post in this thread)
Will Melbourne Instruments Roto Control work with the MM specifically, will the motorised knobs work? I’m thinking probably not because of the one way MIDI traffic on the MM but perhaps will work in the future 
I used the old Arturia Keystep 32 (out of production) , and it worked well, only using the USB-C adapter provided by 4ms.
How were you using the Hermod+ to control MM. Trying this myself and can’t get it to work,
confirming that wireless midi using cem’s widi bud pro (with the usb-c adapter provided by 4ms), works like a charm
Thanks for this info, I just picked one up and it is working great with the MM to receive MIDI from both my iPad Pro and my Macbook Pro. And as bonus it also works with one of my other modules that does MIDI to CV (Tubbutec Brainstep)
+1 for this post. The WIDI bud pro works perfectly. I’m using the MusiKraken app which I recommend people check out - it has a bunch of insanely cool camera / gestural input sources as options and also lets you filter and scale the MIDI in the app to save you from needing to condition your CV in MM or on VCV rack. I’ll be posting videos in the coming weeks pairing this app, the WIDI bud pro, and MM. Thanks everyone!
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Can’t edit my post from October to add this so…
Just added a USB Cable too the Metropolix, works fine.
FYI I tested 3 Novation Launch Control XLs yesterday. One old and two new (I believe they had a recent production run) . I tested all three using various usb-A cables including ferite-shielded with USB-A to USB-C adapters and the rare USB-B to USB-C cable. The ground noise coming from all three distracted me from trying midi-learn. (I have paired other devices and cross-checked after this symptom arose without issue). Short of trying a ferite shielded USB-B to USB-C cable I think the Launch Control XLs have a noise problem based on my sample. (Just the MM and ES-9 in the rack)
Tested with Beta 2.0 13.7
Squarp Pyramid and Roli Seaboard Block both work well.