thank you for your answer. The hardware volume control helped to get rid of the cracks. This is a big step forward.
I tried before a lot the buffer rate etc for the synchronous mode, but I didn´t find any adjunstment which could solve the dropouts and stopping of the music. I also tried it in the squeezebox server adjustments, but also there I didn´t find a satisfying solution.
Can it be that the raspberry 2 as a squeezebox server is simply overstrained ?
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