From alsamixer I switched off / muted "IEC958 Loop" which did the trick Also "Mic Boost (+20dB)" needed to be muted / switched off in order to avoid noise. Other alsamixer settings could be kept unmuted. (Somehow I thought and remembered that it should have been some other settings muted / switched off - but maybe I had just forgotten...??)Yamaha DS-XG (YMF754)], what setting did you use to get it to work.
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