diff --git a/tracker/gioui/specanalyzer.go b/tracker/gioui/specanalyzer.go
index 966925e..8e00883 100644
--- a/tracker/gioui/specanalyzer.go
+++ b/tracker/gioui/specanalyzer.go
@@ -35,13 +35,9 @@ func (s *SpectrumState) Layout(gtx C) D {
 	var chnModeTxt string = "???"
 	switch tracker.SpecChnMode(t.Model.SpecAnChannelsInt().Value()) {
 	case tracker.SpecChnModeCombine:
-		chnModeTxt = "Combine"
+		chnModeTxt = "Sum"
 	case tracker.SpecChnModeSeparate:
 		chnModeTxt = "Separate"
-	case tracker.SpecChnModeLeft:
-		chnModeTxt = "Left"
-	case tracker.SpecChnModeRight:
-		chnModeTxt = "Right"
 	case tracker.SpecChnModeOff:
 		chnModeTxt = "Off"
 	}
diff --git a/tracker/spectrum.go b/tracker/spectrum.go
index 266bc07..241592d 100644
--- a/tracker/spectrum.go
+++ b/tracker/spectrum.go
@@ -45,15 +45,14 @@ const (
 	SpecChnModeOff      SpecChnMode = iota // no spectrum analysis is done to save CPU resources
 	SpecChnModeCombine                     // calculate a single combined spectrum for both channels
 	SpecChnModeSeparate                    // calculate separate spectrums for left and right channels
-	SpecChnModeLeft                        // calculate spectrum only for the left channel
-	SpecChnModeRight                       // calculate spectrum only for the right channel
 	NumSpecChnModes
 )
 
 const (
-	SpecSmoothingSlow SpecSmoothing = iota
-	SpecSmoothingMedium
+	SpecSmoothingMedium SpecSmoothing = iota
 	SpecSmoothingFast
+	SpecSmoothingSlow
+
 	NumSpecSmoothing
 )
 
@@ -142,12 +141,6 @@ func (a *SpecAnalyzer) init(s SpecAnSettings) {
 func (s *SpecAnalyzer) update(buf sointu.AudioBuffer) *Spectrum {
 	ret := s.broker.GetSpectrum()
 	switch s.settings.ChnMode {
-	case SpecChnModeLeft:
-		s.process(buf, 0)
-		ret[0] = append(ret[0], s.temp.power[0]...)
-	case SpecChnModeRight:
-		s.process(buf, 1)
-		ret[1] = append(ret[1], s.temp.power[1]...)
 	case SpecChnModeSeparate:
 		s.process(buf, 0)
 		s.process(buf, 1)
@@ -158,7 +151,6 @@ func (s *SpecAnalyzer) update(buf sointu.AudioBuffer) *Spectrum {
 		s.process(buf, 1)
 		ret[0] = append(ret[0], s.temp.power[0]...)
 		vek32.Add_Inplace(ret[0], s.temp.power[1])
-		vek32.MulNumber_Inplace(ret[0], 0.5)
 	}
 	// convert to decibels
 	for c := range 2 {