WPR_Histogram_Vol indicator with additional averaging of the resulting histogram. A similar averaging is applied to dynamic overbought/oversold levels as well.

//+-----------------------------------------+  //|  INDICATOR INPUTS                       |  //+-----------------------------------------+  input uint                WPRPeriod=14;             // indicator period  input ENUM_APPLIED_VOLUME VolumeType=VOLUME_TICK;   // volume   input int                 HighLevel2=+20;           // overbought level 2  input int                 HighLevel1=+15;           // overbought level 1  input int                 LowLevel1=-15;            // oversold level 1  input int                 LowLevel2=-20;            // oversold level 2  input Smooth_Method       MA_SMethod=MODE_SMA_;     // Averaging method  input uint                MA_Length=12;             // Smoothing depth                      input int                 MA_Phase=15;              // first smoothing parameter,  //---- for JJMA, changing within -100 ... +100, affects the transient process quality;  //---- for VIDIA this is CMO period, for AMA this is a slow average  input int                 Shift=0;                  // Indicator horizontal shift in bars

The indicator uses SmoothAlgorithms.mqh library classes (copy it to <terminal_data_folder>\MQL5\Include). The use of the classes was thoroughly described in the article "Averaging Price Series for Intermediate Calculations Without Using Additional Buffers".

Fig. 1. XWPR_Histogram_Vol indicator