Dear Gentlemen, thank You for your support. The issue is closed. I tried starting alsamixer -c 1 That's ok.
I used amixer to unmute all the chanels of my card: e.g.: amixer -c 1 sset PCM unmute
the Problem was that the default links were made wrong. e.g. /dev/dsp was linked to /dev/dsp0 and so on. I linked /dev/dsp to /dev/dsp1. Now it works fine.
I hope that this helps others.
sincerly yours Jörg
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