Thank you for your answer, that’s great !
I’ll go that way then.
Yihaaaa ! Great 
Are you using an external drive ?
I have a small portable USB drive plugged in to the hub to do Time Machine backups
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Ok so you use only “internal” VST ?
I do - but I know others (including my development partner) who keep samples on external drives, also via USB, with no issues.
I wouldn’t install the actual VSTs on an external drive but it’s generally fine to have the samples live externally.
The point is, there’s generally no problem using USB instead of old-fashioned DIN and my own experience has been that USB is way more reliable.
Only with Gig Performer with other plugin host it can be a nightmare when you switch on/off an USB controller. That’s why “historically” I have two of my keyboards controllers on the DIN5 MIDI of my audio interface (I have two MIDI in). I don’t know what you did regarding USB MIDI devices connections, but you did it well!
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I don’t really trust my Windows-System to properly handle USB-connections over a longer time period. I already encountered the strangest effects, that’s why i connect my MIDI-keyboard via DIN5 - but i only have one keyboard, so i won’t have those limitations that @richw described above, which are valid points.
I use this to merge my 2 keyboards via DIN5. Have had zero problems, but I carry a spare box just in case. On sale now at Perfect Circuit for $58.99 US.
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But using the Roland A800 Pro integrated merger is free… 
Hi Dextroze,
I use both DIN and usb-midi at the same time on one laptop:
My yamaha MFC-10 sends midi-out to my motif es8 and via midi-through goes into an edirol UM3ex usb-midi hub, this way I can PC and CC messages (currently I have two FC 5 pedals, and two FC7 pedals connected) to GP and the motif, on one channel, or divided on several, whatever suits best.
Next, I have a launchkey connected via a simple Icidu 4port usb-hub.
That Icidu device has plugged in: my focusrite scarlett 18i8, the edirol UM3ex, that launchkey, and an old korg nanopad.
If you’re going this way, I should tell you: please remind which usb port on the computer or laptop you plugged the usb-hub in!!
Otherwise, it could get messy, in my experience…
Good luck!
I use 2 Studiologic controllers. No such luck… 
What do you mean?
The Studiologic controllers don’t have a MIDI merger. I’ve tried doing what Dextroze explained in the OP.
1st Keyboard > midi out to
Midi in of 2nd Keyboard > Midi out to
Midi in of Sound interface.
I know that - I use one of those myself but why aren’t you just using a USB hub and plug both studio logic keyboards into it?
I needed another expression pedal, so I use MIDI Solutions Pedal Controller which is DIN5. Plus my USB audio interface is DIN5. Simpler just to keep it all DIN…and it just works all the time.
Interesting. Perhaps we can chat offline about how I can use their products to eventually convert my setup from DIN to MIDI?
And my wife thanks you for finding more gear for me to buy… 
Thank you guys for your answers.
I think I won’t need 2 expression pedals but…if I did…I still can go the USB Hub’s way ?
From my point of view it seems to be the easiest way for me, and I just hope this is stable !
Thanks for your help guys