Automatic playlist using just CasparCG 2.1 AMCP Protocol

Hi... I'm trying find a way to write a ACMP 2.1 commands list to insert an automatic playlist to the server with no pisitive results until now. My problem is when i use LOADBG to add a file to playlist, until it be played i can't add another file to this channel-layer or first is override.

Any idea or solution about it?

Sorry for my english, is not my main language

Thanks in advance