[alsa-devel] ALSA MIDI exclusive mode ?

[happy musicmaker]

I ready somewhere that some applications, like Bitwig, allocate(?) MIDI
ports in "exclusive" mode so that other application cannot connect to the
MIDI ports. I used Bitwig and confirmed  that after starting Bitwig in
qjackctrl you cannot connect any of the MIDI write/read ports. ( qjackctrl
MIDI option  is set to "none") I could not find any documentation on such
"exclusive" feature though ?