final cut pro x can't play audio :(

Hi. i'm used mac studio with Protools Carbon audio Interface.

i setting Protools Carbon interface output to 27/28 on audio/midi Setup page(Speaker), so i can play everything on mac system (itunes, youtube, mac sound effect and whatever..)

but on iMovie and FCPX can't play audio through my audio interface..

how can i fix that?

if i change default mac studio speakers on system setting, it works fine..

why FCPX and iMovie can't follow Audio/midi setup speaker settings?