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Noticed this problem a few weekends ago.  Loud ping before and after each walk up song and inning break songs.  OK so we have the same speaker, I connected to my Bose speaker and there was no ping.  I didn't notice last year because I just started apple music and had already purchase all the walk-up songs.  I couldn't figure out how to export import change files by tomorrow.  So I got an aux cord and plugged it in went through all of it and no ping!  It's the big bad loud speaker, which I have yet to find any help on that end.  I have a temporary fix until I can contact them anyway.  The girls didn't even notice the ping!  ;D