ALSA and Ensoniq 1371

Every time I start KDE, the sound goes berserk. I have identified the problem as an activated "IEC958 1" selection in alsamixer(gui). When it is muted, the noise stops. However, this setting is not saved and the noise returns on the next login. How can I permanently disable this part of the sound device. I have looked at /usr/share/alsa/alsa.conf and /usr/share/alsa/cards/ENS1371.conf, but it is all Greek to me.