Connect External Audio to U-Mix Control Pro 2

Hi,
I tried to connect my iPhone to the U-Mix Control Pro 2 into Input Audio 1/2 via Cinch. I was not able to find an appropriate thread in the forum.
How can I use it. No matter what option I selected in the settings - audio area of mixvibes - no sound out of the amp which is connected to Output 1/2.
What configuration can I use in order to use mp3s from Mixvibes software plus on demand some tracks from the iPhone?
thank you.
Peter
I tried to connect my iPhone to the U-Mix Control Pro 2 into Input Audio 1/2 via Cinch. I was not able to find an appropriate thread in the forum.
How can I use it. No matter what option I selected in the settings - audio area of mixvibes - no sound out of the amp which is connected to Output 1/2.
What configuration can I use in order to use mp3s from Mixvibes software plus on demand some tracks from the iPhone?
thank you.
Peter