Directional Bias Trailing Stop for Amibroker (AFL)

/*------------------------------------------------------------------------ 
   Directional Bias Trailing Stop for Amibroker modified from Leon Wilson 
-------------------------------------------------------------------------*/ 
Value3 = Param("Channel Periods",34, 7, 55); 
Value4 = Param("OverBought Region",75,55, 90 ); 
Value6 = Param("Initial Stop",0,0, 10000 ); 
StpLvl= Param("StopLevel",66,1,236,1); /*Adjust to keep the stop from dropping past the relevant low*/ 
MCT =  (Sum(abs(Close -Ref(Close,-1)),5))/5; 
up  =  PDI(Value3); 
down  =  MDI(Value3); 
Index  =  100-(100/(1+(up/down+0.0001))); 
OB = (Index -Value4); 
Bullish =  Close-(Close*(OB/100)); 
DBiasStop =  IIf(Bullish >= Close,Low -(Bullish - Close ), Low ); 
if( ParamToggle("Combine DynamicBR & Directional Bias?", "No|Yes" ) ) DBiasStop = IIf(DBiasStop >= DBRStop, DBiasStop, DBRStop ); 
DBiasStopARR = HHV(DBiasStop, StpLvl ); 
StopMCT = DBiasStop - MCT; 
StopMCTArr = HHV(StopMCT, StpLvl ); 
Plot(DBiasStopArr, "", colorBlue, styleThick ); 
Plot(StopMCTArr, "", colorRed, styleDots );