Sound Alert

[Forex Trader]

Can somebody help me how to make MetaTrader sound an alarm when one colour bar changes to another colour bars for the below indicator?

//---- indicator settings
#property indicator_separate_window
#property indicator_buffers 3
#property indicator_color1 LimeGreen
#property indicator_color2 Yellow
#property indicator_color3 FireBrick
//---- indicator parameters
extern int EMAPeriod=34;
extern double AngleTreshold=0.2;
extern int StartEMAShift=6;
extern int EndEMAShift=0;
//---- indicator buffers
double UpBuffer[];
double DownBuffer[];
double ZeroBuffer[];
//+------------------------------------------------------------------+
//| Custom indicator initialization function |
//+------------------------------------------------------------------+
int init()
{
//---- 2 additional buffers are used for counting.
IndicatorBuffers(3);
//---- drawing settings
SetIndexStyle(0,DRAW_HISTOGRAM,STYLE_SOLID,2);
SetIndexStyle(1,DRAW_HISTOGRAM,STYLE_SOLID,2);
SetIndexStyle(2,DRAW_HISTOGRAM,STYLE_SOLID,2);
IndicatorDigits(MarketInfo(Symbol(),MODE_DIGITS)+2 );
//---- 3 indicator buffers mapping
if(!SetIndexBuffer(0,UpBuffer) &&
!SetIndexBuffer(1,DownBuffer) &&
!SetIndexBuffer(2,ZeroBuffer))
Print("cannot set indicator buffers!");
//---- name for DataWindow and indicator subwindow label
IndicatorShortName("EMAAngleZero("+EMAPeriod+","+AngleTreshold+","+StartEMAShift+","+EndEMAShift+")");
//---- initialization done
return(0);
}
//+------------------------------------------------------------------+
//| The angle for EMA |
//+------------------------------------------------------------------+
int start()
{
double fEndMA, fStartMA;
double fAngle, mFactor, dFactor;
int nLimit, i;
int nCountedBars;
double angle;
int ShiftDif;

if(EndEMAShift >= StartEMAShift)
{
Print("Error: EndEMAShift >= StartEMAShift");
StartEMAShift = 6;
EndEMAShift = 0;
}

nCountedBars = IndicatorCounted();
//---- check for possible errors
if(nCountedBars<0)
return(-1);
//---- last counted bar will be recounted
if(nCountedBars>0)
nCountedBars--;
nLimit = Bars-nCountedBars;
dFactor = 3.14159/180.0;
mFactor = 10000.0;
if (Symbol() == "USDJPY") mFactor = 100.0;
ShiftDif = StartEMAShift-EndEMAShift;
mFactor /= ShiftDif;
//---- main loop
for(i=0; i {
fEndMA=iMA(NULL,0,EMAPeriod,0,MODE_EMA,PRICE_MEDIA N,i+EndEMAShift);
fStartMA=iMA(NULL,0,EMAPeriod,0,MODE_EMA,PRICE_MED IAN,i+StartEMAShift);
// 10000.0 : Multiply by 10000 so that the fAngle is not too small
// for the indicator Window.
fAngle = mFactor * (fEndMA - fStartMA);
// fAngle = MathArctan(fAngle)/dFactor;
DownBuffer[i] = 0.0;
UpBuffer[i] = 0.0;
ZeroBuffer[i] = 0.0;

if(fAngle > AngleTreshold)
UpBuffer[i] = fAngle;
else if (fAngle < -AngleTreshold)
DownBuffer[i] = fAngle;
else ZeroBuffer[i] = fAngle;
}
return(0);
}
//+------------------------------------------------------------------+

Anyone's help will be hugely thanked.

Kath