Devices that take up multiple HST ports

Please forgive me if this is a dumb question...

Some of the devices connected to my iConnectMIDI4+ use two HST ports. For example, my Arturia Microbrute and my Alesis VI61.

Does the second port actually do anything? I can't seem to make them control any of the other devices. 

If they don't do anything, is there anyway to remove them so I can get the HST ports back to use for other devices?




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