Problem with WTV020

hi, i've purchased wtv020-sd.


i use microsd 2gb, in i've copied ad4 files audio.
i used sketch:

/*
example: control wtv020-sd-16p module play voices arduino board.
created diego j. arevalo, august 6th, 2012.
released public domain.
*/

#include <wtv020sd16p.h>

int resetpin = 2;  // pin number of reset pin.
int clockpin = 3;  // pin number of clock pin.
int datapin = 4;  // pin number of data pin.
int busypin = 5;  // pin number of busy pin.

/*
create instance of wtv020sd16p class.
1st parameter: reset pin number.
2nd parameter: clock pin number.
3rd parameter: data pin number.
4th parameter: busy pin number.
*/
wtv020sd16p wtv020sd16p(resetpin,clockpin,datapin,busypin);

void setup() {
 //initializes module.
 wtv020sd16p.reset();
}

void loop() {
 //plays synchronously audio file. busy pin used method.
 wtv020sd16p.playvoice(0);
 //plays asynchronously audio file.
 wtv020sd16p.asyncplayvoice(1);
 //plays audio file number 1 during 2 seconds.
 delay(5000);
 //pauses audio file number 1 during 2 seconds.  
 wtv020sd16p.pausevoice();
 delay(5000);
 //resumes audio file number 1 during 2 seconds.
 wtv020sd16p.pausevoice();
 delay(5000);  
 //stops current audio file playing.
 wtv020sd16p.stopvoice();
 //plays synchronously audio file. busy pin used method.  
 wtv020sd16p.asyncplayvoice(2);
 delay(2000);  
 //mutes audio file number 2 during 2 seconds.
 wtv020sd16p.mute();
 delay(2000);
 //unmutes audio file number 2 during 2 seconds.
 wtv020sd16p.unmute();
 delay(2000);    
 //stops current audio file playing.
 wtv020sd16p.stopvoice();
}

the problem can not hear anything!
can me please? i'm going crazy.
thanks in advance.

i did various test , in speaker feel different whistles.
i waiting answers problem

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