diff --git a/Source/PS_Source/ProcessedStretch.h b/Source/PS_Source/ProcessedStretch.h
index 7be7563..abc954a 100644
--- a/Source/PS_Source/ProcessedStretch.h
+++ b/Source/PS_Source/ProcessedStretch.h
@@ -423,8 +423,8 @@ inline void spectrum_do_free_filter(shared_envelope& env, int nfreq, double samp
 		double binhz = (samplerate / 2.0) / nfreq * i;
 		if (binhz >= 30.0)
 		{
-			double norm = jmap<double>(binhz, 0.0, samplerate / 2.0, 0.0, 1.0);
-			double db = jmap<double>(env->GetInterpolatedNodeValue(pow(norm, 0.25)), 0.0, 1.0, -36.0, 12.0);
+			double norm = 0.150542*log(0.0333333*binhz);
+			double db = jmap<double>(env->GetInterpolatedNodeValue(norm), 0.0, 1.0, -36.0, 12.0);
 			freq2[i] = freq1[i] * Decibels::decibelsToGain(db);
 		}
 		else
diff --git a/Source/PluginEditor.cpp b/Source/PluginEditor.cpp
index ec08b83..acb6280 100644
--- a/Source/PluginEditor.cpp
+++ b/Source/PluginEditor.cpp
@@ -36,7 +36,8 @@ PaulstretchpluginAudioProcessorEditor::PaulstretchpluginAudioProcessorEditor(Pau
     m_free_filter_component.set_envelope(processor.m_free_filter_envelope);
 	m_free_filter_component.TimeFromNormalized = [this](double x) 
 	{ 
-		return jmap<double>(pow(x, 4.0), 0.0, 1.0, 30.0, processor.getSampleRateChecked()/2.0);
+		//return jmap<double>(pow(x, 3.0), 0.0, 1.0, 30.0, processor.getSampleRateChecked()/2.0);
+		return 30.0*pow(1.05946309436, x*115.0);
 	};
 	m_free_filter_component.ValueFromNormalized = [this](double x)
 	{
diff --git a/readme.txt b/readme.txt
index b809a2f..2a22d55 100644
--- a/readme.txt
+++ b/readme.txt
@@ -9,7 +9,7 @@ Released under GNU General Public License v.2 license.
 History :
 
 02-27-2018 1.0.3
-	-Added free filter spectral processing module (may use lots of CPU)
+	-Added free filter spectral processing module
 	-Basic feature to allow offline rendering of the output of the plugin into a new file
 	-Fixed bug with the number of harmonics parameter not getting saved and recalled
 02-23-2018 1.0.2