the one with usb soundcard works. maybe i have to change something in my intern soundcard options but i dont know how and where ?
Are you are talking of your inputs (all in usb) or your output one in usb & one in your main board?
That's why I ask you a new config report.
If you are talking of the outputs check that the channels are ok in the sound options & also on the skin Channel1 left, channel 2 right. If your sound options are ok & both channel on 1 just click on the channel number on the right deck it will move to 2
Sorry I did a mistake with the preamp at 43db. Your turntables are directly connected on line without the need of a strong preamp.
There is a better way to make your setup, have a look to the asio4all driver here:
viewtopic.php?f=207&t=12058. You aren't using the u46mk2 sound card but this driver is very useful & will help you to use asio & a lower latency with any sound cards installed. Read their excellent docs
www.asio4all.com.