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I don't think it can do that, but if you use dfplayer it is possible to have the humming sound and movement sound at the same time
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i forgot to said for use that mp3 player you must create a folder called mp3 in your sd card inside your folder is the filed you want to play. I learn how to use it in this website:http://stonez56.blogspot.tw/2015/03/arduino-dfplayer-mini-mp3-module.html
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