Mix from looped clip to qued clip?

I have a problem.
I want to do a mix from a looped clip to a que clip on the same channel, how do i do that?
Right now i can only get the mix to work if the second clip starts immediately.

Something like this:

PLAY 1-1 AMB LOOP
LOADBG 1-1 GO1080P25 MIX 50 AUTO
CALL 1-1 LOOP 0
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do i enter this in custom command in the caspar client, iā€™m new to casparCG