A little change on MACD

//+------------------------------------------------------------------+
//| Custom MACD+OsMA.mq4 |
//| Copyright © 2004, MetaQuotes Software Corp. |
//| http://www.metaquotes.net/ |
//+------------------------------------------------------------------+
#property copyright "Copyright © 2004, MetaQuotes Software Corp."
#property link "http://www.metaquotes.net/"
//---- indicator settings
#property indicator_separate_window
#property indicator_buffers 3
#property indicator_color1 Silver
#property indicator_color2 Red
#property indicator_color3 Silver
//---- indicator parameters
extern int FastEMA=5;
extern int SlowEMA=34;
extern int SignalSMA=9;
extern bool AlertOn = true;
//---- indicator buffers
double ind_buffer1[];
double ind_buffer2[];
double ind_buffer3[];
//+------------------------------------------------------------------+
//| Custom indicator initialization function |
//+------------------------------------------------------------------+
int init()
{
//---- drawing settings
SetIndexStyle(0,DRAW_LINE,STYLE_SOLID,1);
SetIndexStyle(1,DRAW_LINE,STYLE_SOLID,1);
SetIndexStyle(2,DRAW_HISTOGRAM,STYLE_SOLID,2);
SetIndexDrawBegin(1,SignalSMA);
IndicatorDigits(MarketInfo(Symbol(),MODE_DIGITS)+1);
//---- indicator buffers mapping
if(!SetIndexBuffer(0,ind_buffer1) && !SetIndexBuffer(1,ind_buffer2) && !SetIndexBuffer(2,ind_buffer3))
Print("cannot set indicator buffers!");
//---- name for DataWindow and indicator subwindow label
IndicatorShortName("MACD("+FastEMA+","+SlowEMA+","+SignalSMA+")");
SetIndexLabel(0,"MACD");
SetIndexLabel(1,"Signal");
SetIndexLabel(2,"OsMA");
//---- initialization done
return(0);
}
//+------------------------------------------------------------------+
//| Moving Averages Convergence/Divergence |
//+------------------------------------------------------------------+
int start()
{
int limit;

double OsMANow, OsMAPrevious;
static datetime prevtime = 0;

int counted_bars=IndicatorCounted();
//---- check for possible errors
if(counted_bars<0) return(-1);
//---- last counted bar will be recounted
if(counted_bars>0) counted_bars--;
limit=Bars-counted_bars;
//---- macd counted in the 1-st buffer
for(int i=0; i<limit; i++)
ind_buffer1[i]=iMA(NULL,0,FastEMA,0,MODE_EMA,PRICE_CLOSE,i)-iMA(NULL,0,SlowEMA,0,MODE_EMA,PRICE_CLOSE,i);
//---- signal line counted in the 2-nd buffer
for(i=0; i<limit; i++)
ind_buffer2[i]=iMAOnArray(ind_buffer1,Bars,SignalSMA,0,MODE_SMA,i);
for(i=0; i<limit; i++)
ind_buffer3[i]=iOsMA(NULL,0,FastEMA,SlowEMA,SignalSMA,PRICE_CLOSE,i);
//---- done




// ======= Alert =========

   if(AlertOn)
   {
      if(prevtime == Time[0]) 
      {
         return(0);
      }
      prevtime = Time[0];
   
      OsMANow = iOsMA(NULL, 0, FastEMA, SlowEMA, SignalSMA, PRICE_CLOSE, 0);
      OsMAPrevious = iOsMA(NULL, 0, FastEMA, SlowEMA, SignalSMA, PRICE_CLOSE, 1);
   
  
   
      if((OsMANow < 0) && (OsMAPrevious > 0)) {
         PlaySound("alert.wav");
   
   }
   
      if((OsMANow > 0) && (OsMAPrevious < 0)) {
         PlaySound("alert.wav");
   
   }
   IndicatorShortName("MACD("+FastEMA+","+SlowEMA+","+SignalSMA+") (Alert on)");
   }
   
// ======= Alert Ends =========










return(0);
}