Could you please be more precise about the „ticks“ you mentioned? Are there sound dropouts? Is the audio quality otherwise good or is there any noise? Does the Squeezebox Server run smoothly or do errors appear on the web interface during playback?
Have you previously tried to select the „USB sound card“ in the Raspberry settings? Otherwise, please select „none“, restart your device and then select „USB sound card“.
Mario,
– no dropouts,
– audio-quality otherwise good,
– no other noise,
– just short ticks – sounds like you want to start the gas-burner at a barbecue grill