sound not played at startup

i don't understand why when connect arduino usb-power doesn't play startup sound mp3 external module connected.

the track played when reset card.

why?

this setup code using:

code: [select]

void setup() {
 
  // initialize button pin input:
  pinmode(buttonpin, input);
  pinmode(buttonpin9, input);
  pinmode(buttonpin10, input);
 
  // initialize led output:
  pinmode(ledpin, output);
  pinmode(ledpin12, output);
  pinmode(ledpin5, output);
 
  // initialize serial communication:
  serial.begin(9600);
   
    serial.write(0x7e); // vol max
    serial.write(0x03);
    serial.write(0xa4);
    serial.write(0x08);
    serial.write(0x7e);
   
    serial.write(0x7e); // startup sound
    serial.write(0x07);
    serial.write(0xb0);
    serial.write(0x30);
    serial.write(0x32);
    serial.write(0x30);
    serial.write(0x30);
    serial.write(0x32);
    serial.write(0x7e);

    digitalwrite(ledpin5, high); // on/off status led
}

try putting pause before

  // initialize button pin input:
  pinmode(buttonpin, input);
  pinmode(buttonpin9, input);
  pinmode(buttonpin10, input);

the module may need time startup

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