DSP: Added a second reset method to flush the IIR filter to a specific value

modules/juce_dsp/processors/juce_IIRFilter.h

@@ -86,7 +86,13 @@ namespace IIR
             Note that this clears the processing state, but the type of filter and
             its coefficients aren't changed.
         */
-        void reset();
+        void reset()            { reset (SampleType {0}); }
+
+        /** Resets the filter's processing pipeline to a specific value.
+
+            See @reset
+        */
+        void reset (SampleType resetToValue);
 
         //==============================================================================
         /** Called before processing starts. */

modules/juce_dsp/processors/juce_IIRFilter_Impl.h

@@ -61,7 +61,7 @@ Filter<SampleType>::Filter (Coefficients<typename Filter<SampleType>::NumericTyp
 }
 
 template <typename SampleType>
-void Filter<SampleType>::reset()
+void Filter<SampleType>::reset (SampleType resetToValue)
 {
     auto newOrder = coefficients->getFilterOrder();
 
@@ -73,7 +73,7 @@ void Filter<SampleType>::reset()
     }
 
     for (size_t i = 0; i < order; ++i)
-        state[i] = SampleType {0};
+        state[i] = resetToValue;
 }
 
 template <typename SampleType>