No Sound Output - U-Mix44

Hello
I've just bought a U-Mix44 to try to improve the sound quality of the DJ mixes that I record from my CDJs onto my computer.
I have connected the CDJs to the RCA input channels and an orange light comes on.
I have connected the RCA output channels to my line 1 and line 2 on my mixer - but there is no sound. And no orange light.
Please can you advise what I am doing wrong.
Thanks
James
I've just bought a U-Mix44 to try to improve the sound quality of the DJ mixes that I record from my CDJs onto my computer.
I have connected the CDJs to the RCA input channels and an orange light comes on.
I have connected the RCA output channels to my line 1 and line 2 on my mixer - but there is no sound. And no orange light.
Please can you advise what I am doing wrong.
Thanks
James