Sorry, I think I was not clear ... after I tried to connect, it seems that the channel 1 of the mixer was faulty .. he is only noise .. channel 2 is normal. and now I'm trying to connect a guitar ... not the sound card. I made a new video with the problem ...
and also realized that when I do not put the whole plug have sound but with noise and when I put the whole plug just keep the noise.
channel 2 works ok.
the problem happens only on channel 1.
see new video ....
thanks a lot...