diff --git a/Indicators/MyIndicators/Authors/Ehlers/1_Smoothers/Butterworth_Filter_Pro.mq5 b/Indicators/MyIndicators/Authors/Ehlers/1_Smoothers/Butterworth_Filter_Pro.mq5
index bfd9722..f4f637e 100644
--- a/Indicators/MyIndicators/Authors/Ehlers/1_Smoothers/Butterworth_Filter_Pro.mq5
+++ b/Indicators/MyIndicators/Authors/Ehlers/1_Smoothers/Butterworth_Filter_Pro.mq5
@@ -1,10 +1,9 @@
 //+------------------------------------------------------------------+
 //|                                     Butterworth_Filter_Pro.mq5   |
 //|                                          Copyright 2025, xxxxxxxx|
-//|                                                                  |
 //+------------------------------------------------------------------+
 #property copyright "Copyright 2025, xxxxxxxx"
-#property version   "1.10" // Adapted to new universal calculator
+#property version   "2.00" // Optimized for incremental calculation
 #property description "John Ehlers' Higher-Order Butterworth Filter."
 
 #property indicator_chart_window
@@ -14,14 +13,14 @@
 #property indicator_type1   DRAW_LINE
 #property indicator_color1  clrMediumPurple
 #property indicator_style1  STYLE_SOLID
-#property indicator_width1  1
+#property indicator_width1  2
 
 #include <MyIncludes\Butterworth_Calculator.mqh>
 
 //--- Input Parameters ---
-input int                       InpPeriod = 20;     // Critical Period for the filter
-input ENUM_BUTTERWORTH_POLES    InpPoles  = POLES_TWO; // Number of poles (2 or 3)
-input ENUM_APPLIED_PRICE_HA_ALL InpSourcePrice = PRICE_CLOSE_STD;
+input int                       InpPeriod       = 20;    // Critical Period for the filter
+input ENUM_BUTTERWORTH_POLES    InpPoles        = POLES_TWO; // Number of poles (2 or 3)
+input ENUM_APPLIED_PRICE_HA_ALL InpSourcePrice  = PRICE_CLOSE_STD;
 
 //--- Indicator Buffers ---
 double    BufferFilter[];
@@ -46,14 +45,13 @@ int OnInit()
       IndicatorSetString(INDICATOR_SHORTNAME, StringFormat("Butterworth(%d,%d)", InpPeriod, (int)InpPoles));
      }
 
-// CORRECTED: Pass the source type to the Init function
    if(CheckPointer(g_calculator) == POINTER_INVALID || !g_calculator.Init(InpPeriod, InpPoles, SOURCE_PRICE))
      {
       Print("Failed to initialize Butterworth Calculator.");
       return(INIT_FAILED);
      }
 
-   PlotIndexSetInteger(0, PLOT_DRAW_BEGIN, InpPeriod);
+   PlotIndexSetInteger(0, PLOT_DRAW_BEGIN, 3);
    IndicatorSetInteger(INDICATOR_DIGITS, _Digits);
 
    return(INIT_SUCCEEDED);
@@ -67,7 +65,16 @@ void OnDeinit(const int reason)
   }
 
 //+------------------------------------------------------------------+
-int OnCalculate(const int rates_total, const int, const datetime&[], const double &open[], const double &high[], const double &low[], const double &close[], const long&[], const long&[], const int&[])
+int OnCalculate(const int rates_total,
+                const int prev_calculated,
+                const datetime &time[],
+                const double &open[],
+                const double &high[],
+                const double &low[],
+                const double &close[],
+                const long &tick_volume[],
+                const long &volume[],
+                const int &spread[])
   {
    if(CheckPointer(g_calculator) == POINTER_INVALID)
       return 0;
@@ -78,7 +85,7 @@ int OnCalculate(const int rates_total, const int, const datetime&[], const doubl
    else
       price_type = (ENUM_APPLIED_PRICE)InpSourcePrice;
 
-   g_calculator.Calculate(rates_total, price_type, open, high, low, close, BufferFilter);
+   g_calculator.Calculate(rates_total, prev_calculated, price_type, open, high, low, close, BufferFilter);
    return(rates_total);
   }
 //+------------------------------------------------------------------+