i'd really like to keep my space, but as seen on this screenshot, If Space is activated in Sonar it is not recognized by H9Control.JPG

and if i launch H9Control before Sonar, Space is not activable in Sonar…

Well, that's a problem with the Windows OS.  Only one device can use a particular MIDI device at a time.  Once one device opens a MIDI device, it looks out all other devices from being able to use that device.

What version of Windows do you have?  In Windows 10 there's a new MIDI API that makes it possible for multiple apps to use a MIDI device.  We've been meaning to add support for it but haven't done so yet.  If you're using Windows 10, we might be able to fix this problem for you in a future release.