Hi,
It seems that a group in created for all song. We cannot create a group specially for a song, right ?
Each Song automatically creates its own Group channel.
Other Group channels are global, that’s true.
Hi @magicguigui ,
Meanwhile you have a trick option:
Use song’s group (songname channel) for a dedicated group (leave the ones should be group ped together) and send to direct output (e.g stereo out) or to group the ones (e.g.; stereo backing track) you think just simply send out 
This way you will have 1pc song specific group