diff --git a/Include/MyIncludes/BandPass_Calculator.mqh b/Include/MyIncludes/BandPass_Calculator.mqh
new file mode 100644
index 0000000..27c59b3
--- /dev/null
+++ b/Include/MyIncludes/BandPass_Calculator.mqh
@@ -0,0 +1,186 @@
+//+------------------------------------------------------------------+
+//|                                        BandPass_Calculator.mqh   |
+//|      Calculation engine for the John Ehlers' Band-Pass Filter.   |
+//|                                        Copyright 2025, xxxxxxxx  |
+//+------------------------------------------------------------------+
+#property copyright "Copyright 2025, xxxxxxxx"
+
+#include <MyIncludes\HeikinAshi_Tools.mqh>
+
+//+==================================================================+
+//|                                                                  |
+//|           CLASS 1: CBandPassCalculator (Base Class)              |
+//|                                                                  |
+//+==================================================================+
+class CBandPassCalculator
+  {
+protected:
+   int               m_lower_period; // For High-Pass
+   int               m_upper_period; // For SuperSmoother
+   double            m_price[];
+
+   virtual bool      PreparePriceSeries(int rates_total, ENUM_APPLIED_PRICE price_type, const double &open[], const double &high[], const double &low[], const double &close[]);
+
+public:
+                     CBandPassCalculator(void) {};
+   virtual          ~CBandPassCalculator(void) {};
+
+   bool              Init(int lower_period, int upper_period);
+   void              Calculate(int rates_total, ENUM_APPLIED_PRICE price_type, const double &open[], const double &high[], const double &low[], const double &close[], double &bp_buffer[]);
+  };
+
+//+------------------------------------------------------------------+
+bool CBandPassCalculator::Init(int lower_period, int upper_period)
+  {
+   m_lower_period = (lower_period < 2) ? 2 : lower_period;
+   m_upper_period = (upper_period < 2) ? 2 : upper_period;
+   return true;
+  }
+
+//+------------------------------------------------------------------+
+void CBandPassCalculator::Calculate(int rates_total, ENUM_APPLIED_PRICE price_type, const double &open[], const double &high[], const double &low[], const double &close[], double &bp_buffer[])
+  {
+   if(rates_total < 10)
+      return;
+   if(!PreparePriceSeries(rates_total, price_type, open, high, low, close))
+      return;
+
+// --- Intermediate buffer for the High-Pass filter output ---
+   double hp_buffer[];
+   ArrayResize(hp_buffer, rates_total);
+
+// --- High-Pass Filter Coefficients (from LowerPeriod) ---
+   double arg_hp = 1.414 * M_PI / m_lower_period;
+   double a1_hp = exp(-arg_hp);
+   double b1_hp = 2.0 * a1_hp * cos(arg_hp);
+   double c2_hp = b1_hp;
+   double c3_hp = -a1_hp * a1_hp;
+   double c1_hp = (1.0 + c2_hp - c3_hp) / 4.0;
+
+// --- SuperSmoother Filter Coefficients (from UpperPeriod) ---
+   double arg_ss = 1.414 * M_PI / m_upper_period;
+   double a1_ss = exp(-arg_ss);
+   double b1_ss = 2.0 * a1_ss * cos(arg_ss);
+   double c2_ss = b1_ss;
+   double c3_ss = -a1_ss * a1_ss;
+   double c1_ss = 1.0 - c2_ss - c3_ss;
+
+// --- State variables for recursive calculations ---
+   double hp1=0, hp2=0; // High-Pass previous values
+   double bp1=0, bp2=0; // Band-Pass (SuperSmoother) previous values
+
+// --- Full recalculation loop ---
+   for(int i = 0; i < rates_total; i++)
+     {
+      // Initialization period
+      if(i < 4)
+        {
+         hp_buffer[i] = 0;
+         bp_buffer[i] = 0;
+         continue;
+        }
+
+      // --- Step 1: Calculate High-Pass filter value ---
+      double current_hp = c1_hp * (m_price[i] - 2.0 * m_price[i-1] + m_price[i-2]) + c2_hp * hp1 + c3_hp * hp2;
+      hp_buffer[i] = current_hp;
+
+      // --- Step 2: Calculate SuperSmoother on the High-Pass output ---
+      double current_bp = c1_ss * (hp_buffer[i] + hp_buffer[i-1]) / 2.0 + c2_ss * bp1 + c3_ss * bp2;
+      bp_buffer[i] = current_bp;
+
+      // --- Update state variables for next iteration ---
+      hp2 = hp1;
+      hp1 = current_hp;
+      bp2 = bp1;
+      bp1 = current_bp;
+     }
+  }
+
+//+------------------------------------------------------------------+
+bool CBandPassCalculator::PreparePriceSeries(int rates_total, ENUM_APPLIED_PRICE price_type, const double &open[], const double &high[], const double &low[], const double &close[])
+  {
+   ArrayResize(m_price, rates_total);
+   switch(price_type)
+     {
+      case PRICE_CLOSE:
+         ArrayCopy(m_price, close, 0, 0, rates_total);
+         break;
+      case PRICE_OPEN:
+         ArrayCopy(m_price, open, 0, 0, rates_total);
+         break;
+      case PRICE_HIGH:
+         ArrayCopy(m_price, high, 0, 0, rates_total);
+         break;
+      case PRICE_LOW:
+         ArrayCopy(m_price, low, 0, 0, rates_total);
+         break;
+      case PRICE_MEDIAN:
+         for(int i=0; i<rates_total; i++)
+            m_price[i] = (high[i]+low[i])/2.0;
+         break;
+      case PRICE_TYPICAL:
+         for(int i=0; i<rates_total; i++)
+            m_price[i] = (high[i]+low[i]+close[i])/3.0;
+         break;
+      case PRICE_WEIGHTED:
+         for(int i=0; i<rates_total; i++)
+            m_price[i] = (high[i]+low[i]+close[i]+close[i])/4.0;
+         break;
+      default:
+         return false;
+     }
+   return true;
+  }
+
+//+==================================================================+
+class CBandPassCalculator_HA : public CBandPassCalculator
+  {
+private:
+   CHeikinAshi_Calculator m_ha_calculator;
+protected:
+   virtual bool      PreparePriceSeries(int rates_total, ENUM_APPLIED_PRICE price_type, const double &open[], const double &high[], const double &low[], const double &close[]) override;
+  };
+
+//+------------------------------------------------------------------+
+bool CBandPassCalculator_HA::PreparePriceSeries(int rates_total, ENUM_APPLIED_PRICE price_type, const double &open[], const double &high[], const double &low[], const double &close[])
+  {
+   double ha_open[], ha_high[], ha_low[], ha_close[];
+   ArrayResize(ha_open, rates_total);
+   ArrayResize(ha_high, rates_total);
+   ArrayResize(ha_low, rates_total);
+   ArrayResize(ha_close, rates_total);
+   m_ha_calculator.Calculate(rates_total, open, high, low, close, ha_open, ha_high, ha_low, ha_close);
+   ArrayResize(m_price, rates_total);
+   switch(price_type)
+     {
+      case PRICE_CLOSE:
+         ArrayCopy(m_price, ha_close, 0, 0, rates_total);
+         break;
+      case PRICE_OPEN:
+         ArrayCopy(m_price, ha_open, 0, 0, rates_total);
+         break;
+      case PRICE_HIGH:
+         ArrayCopy(m_price, ha_high, 0, 0, rates_total);
+         break;
+      case PRICE_LOW:
+         ArrayCopy(m_price, ha_low, 0, 0, rates_total);
+         break;
+      case PRICE_MEDIAN:
+         for(int i=0; i<rates_total; i++)
+            m_price[i] = (ha_high[i]+ha_low[i])/2.0;
+         break;
+      case PRICE_TYPICAL:
+         for(int i=0; i<rates_total; i++)
+            m_price[i] = (ha_high[i]+ha_low[i]+ha_close[i])/3.0;
+         break;
+      case PRICE_WEIGHTED:
+         for(int i=0; i<rates_total; i++)
+            m_price[i] = (ha_high[i]+ha_low[i]+ha_close[i]+ha_close[i])/4.0;
+         break;
+      default:
+         return false;
+     }
+   return true;
+  }
+//+------------------------------------------------------------------+
+//+------------------------------------------------------------------+