iirc, should allow any (1-16) ... I think ...
(but try 1 first anyway ... , it may also be 0 on your interface, depends how they label them )
if you want to filter, then you can use a patch/patcher , enable midi selector and then CN is the 'midi port'
limitation, no sysex and host/device must be usb midi class compliant ... thats it really.