Perfect Crossover Oscillator Trigger - Amibroker AFL Code

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SetChartOptions(2,chartShowDates);
GraphXSpace = 15;

st3 = EMA(C,3);
st5 = EMA(C,5);
st8 = EMA(C,8);
st10 = EMA(C,10);
st12 = EMA(C,12);
st15 = EMA(C,15);
Lt23 = EMA(C,23);
Lt30 = EMA(C,30);
Lt35 = EMA(C,35);
Lt40 = EMA(C,30);
Lt50 = EMA(C,50);
STosc = ((st3+st5+st8+st10+st12+st15)-(Lt30+Lt35+Lt40+Lt50))*10;
Trig = EMA(STosc,13);

Plot(STOsc,FullName()+" Guppy Oscilator",6,1);
Plot(Trig,"Oscilator Trigger",4,1);

Up = Cross(STosc,Trig);
Dn = Cross(Trig,Stosc);
PlotShapes(Up*shapeUpArrow,colorGreen);
PlotShapes(Dn*shapeDownArrow,colorRed);