Help with coding a DFMiniPlayer with Arduino and a Button

Some people have had that issue with store brand players. I cannot remember what it is but there's one thing in the play function that you need to comment out, I think. Maybe a flush?
Hopefully some user, who remembers more clearly than I, will point it out.
You can also do some digging in a forum search and see if you can find it. The answer does exist here somewhere.
I usually order the good stuff for this exact reason.

Now I'm only getting buzzing and beeping from my speakers rather than my MP3 files when I used the code that you sent previously. I'm gonna try rearranging my wiring to give the MiniPlayer a separate GND. I'll try adding a flush to fix it. Serial.flush() is the correct function, right?

No, they need to share the ground

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