diff --git a/release-packaging/Classes/FluidBufLoudness.sc b/release-packaging/Classes/FluidBufLoudness.sc
index 8b15d68..6b95a20 100644
--- a/release-packaging/Classes/FluidBufLoudness.sc
+++ b/release-packaging/Classes/FluidBufLoudness.sc
@@ -1,7 +1,30 @@
 FluidBufLoudness : FluidBufProcessor{
-    *kr  { |source, startFrame = 0, numFrames = -1, startChan = 0, numChans = -1, features,  kWeighting = 1, truePeak = 1, windowSize = 1024, hopSize = 512, padding = 1, trig = 1, blocking = 0|
+    
+    const <features=#[\loudness, \peak];
+    classvar featuresLookup;
+
+    *initClass {
+        featuresLookup = Dictionary.with(*this.features.collect{|x,i| x->(1<<i)});
+    }
+
+    *prWarnUnrecognised {|sym| ("WARNING: FluidLoudness -" + sym + "is not a recognised option").postln}
+
+    *prProcessSelect {|a|
+        var bits;
+        a.asBag.countsDo{|item,count,i|
+            if(count > 1) { ("Option '" ++ item ++ "' is repeated").warn};
+        };
+        bits = a.collect{ |sym|
+            (featuresLookup[sym.asSymbol] !? {|x| x} ?? {this.prWarnUnrecognised(sym); 0})
+        }.reduce{|x,y| x | y};
+        ^bits
+    }
+    
+    *kr  { |source, startFrame = 0, numFrames = -1, startChan = 0, numChans = -1, features, select, kWeighting = 1, truePeak = 1, windowSize = 1024, hopSize = 512, padding = 1, trig = 1, blocking = 0|
 
         var maxwindowSize = windowSize.nextPowerOfTwo;
+        
+        var selectbits  =  select !? {this.prProcessSelect(select)} ?? {this.prProcessSelect(this.features)};
 
         source = source.asUGenInput;
         features = features.asUGenInput;
@@ -9,13 +32,15 @@ FluidBufLoudness : FluidBufProcessor{
         source.isNil.if {"FluidBufPitch:  Invalid source buffer".throw};
         features.isNil.if {"FluidBufPitch:  Invalid features buffer".throw};
 
-        ^FluidProxyUgen.kr(\FluidBufLoudnessTrigger, -1, source, startFrame, numFrames, startChan, numChans, features,padding, kWeighting, truePeak, windowSize, hopSize, maxwindowSize, trig, blocking);
+        ^FluidProxyUgen.kr(\FluidBufLoudnessTrigger, -1, source, startFrame, numFrames, startChan, numChans, features, padding, selectbits, kWeighting, truePeak, windowSize, hopSize, maxwindowSize, trig, blocking);
     }
 
-    *process { |server, source, startFrame = 0, numFrames = -1, startChan = 0, numChans = -1, features,  kWeighting = 1, truePeak = 1, windowSize = 1024, hopSize = 512, padding = 1, freeWhenDone = true, action|
+    *process { |server, source, startFrame = 0, numFrames = -1, startChan = 0, numChans = -1, features, select,  kWeighting = 1, truePeak = 1, windowSize = 1024, hopSize = 512, padding = 1, freeWhenDone = true, action|
 
         var maxwindowSize = windowSize.nextPowerOfTwo;
-
+        
+        var selectbits  =  select !? {this.prProcessSelect(select)} ?? {this.prProcessSelect(this.features)};
+        
         source = source.asUGenInput;
         features = features.asUGenInput;
 
@@ -25,13 +50,15 @@ FluidBufLoudness : FluidBufProcessor{
 		^this.new(
 			server, nil, [features]
 		).processList(
-			[source, startFrame, numFrames, startChan, numChans, features, padding, kWeighting, truePeak, windowSize, hopSize, maxwindowSize,0],freeWhenDone,action
+			[source, startFrame, numFrames, startChan, numChans, features, padding, selectbits, kWeighting, truePeak, windowSize, hopSize, maxwindowSize,0],freeWhenDone,action
 		);
     }
 
-    *processBlocking { |server, source, startFrame = 0, numFrames = -1, startChan = 0, numChans = -1, features,  kWeighting = 1, truePeak = 1, windowSize = 1024, hopSize = 512, padding = 1, freeWhenDone = true, action|
+    *processBlocking { |server, source, startFrame = 0, numFrames = -1, startChan = 0, numChans = -1, features, select,  kWeighting = 1, truePeak = 1, windowSize = 1024, hopSize = 512, padding = 1, freeWhenDone = true, action|
 
         var maxwindowSize = windowSize.nextPowerOfTwo;
+        
+        var selectbits  =  select !? {this.prProcessSelect(select)} ?? {this.prProcessSelect(this.features)};
 
         source = source.asUGenInput;
         features = features.asUGenInput;
@@ -42,7 +69,7 @@ FluidBufLoudness : FluidBufProcessor{
 		^this.new(
 			server, nil, [features]
 		).processList(
-			[source, startFrame, numFrames, startChan, numChans, features,padding, kWeighting, truePeak, windowSize, hopSize, maxwindowSize,1],freeWhenDone,action
+			[source, startFrame, numFrames, startChan, numChans, features,padding, selectbits, kWeighting, truePeak, windowSize, hopSize, maxwindowSize,1],freeWhenDone,action
 		);
     }
 }
diff --git a/release-packaging/Classes/FluidBufPitch.sc b/release-packaging/Classes/FluidBufPitch.sc
index d62190b..86a0cb1 100644
--- a/release-packaging/Classes/FluidBufPitch.sc
+++ b/release-packaging/Classes/FluidBufPitch.sc
@@ -1,8 +1,30 @@
 FluidBufPitch : FluidBufProcessor{
 
-	*kr { |source, startFrame = 0, numFrames = -1, startChan = 0, numChans = -1, features,  algorithm = 2, minFreq = 20, maxFreq = 10000, unit = 0, windowSize = 1024, hopSize = -1, fftSize = -1, padding = 1, trig = 1, blocking = 0|
+    const <features=#[\pitch, \confidence];
+    classvar featuresLookup;
+
+    *initClass {
+        featuresLookup = Dictionary.with(*this.features.collect{|x,i| x->(1<<i)});
+    }
+
+    *prWarnUnrecognised {|sym| ("WARNING: FluidBufPitch -" + sym + "is not a recognised option").postln}
+
+    *prProcessSelect {|a|
+        var bits;
+        a.asBag.countsDo{|item,count,i|
+            if(count > 1) { ("Option '" ++ item ++ "' is repeated").warn};
+        };
+        bits = a.collect{ |sym|
+            (featuresLookup[sym.asSymbol] !? {|x| x} ?? {this.prWarnUnrecognised(sym); 0})
+        }.reduce{|x,y| x | y};
+        ^bits
+    }
+
+	*kr { |source, startFrame = 0, numFrames = -1, startChan = 0, numChans = -1, features,  select, algorithm = 2, minFreq = 20, maxFreq = 10000, unit = 0, windowSize = 1024, hopSize = -1, fftSize = -1, padding = 1, trig = 1, blocking = 0|
 
         var maxFFTSize = if (fftSize == -1) {windowSize.nextPowerOfTwo} {fftSize};
+        
+        var selectbits  =  select !? {this.prProcessSelect(select)} ?? {this.prProcessSelect(this.features)};
 
         source = source.asUGenInput;
         features = features.asUGenInput;
@@ -10,14 +32,16 @@ FluidBufPitch : FluidBufProcessor{
         source.isNil.if {"FluidBufPitch:  Invalid source buffer".throw};
         features.isNil.if {"FluidBufPitch:  Invalid features buffer".throw};
 
-        ^FluidProxyUgen.kr(\FluidBufPitchTrigger, -1, source, startFrame, numFrames, startChan, numChans, features, padding, algorithm, minFreq, maxFreq, unit, windowSize, hopSize, fftSize, maxFFTSize, trig, blocking);
+        ^FluidProxyUgen.kr(\FluidBufPitchTrigger, -1, source, startFrame, numFrames, startChan, numChans, features, padding, selectbits, algorithm, minFreq, maxFreq, unit, windowSize, hopSize, fftSize, maxFFTSize, trig, blocking);
 
 	}
 
-    *process { |server, source, startFrame = 0, numFrames = -1, startChan = 0, numChans = -1, features,  algorithm = 2, minFreq = 20, maxFreq = 10000, unit = 0, windowSize = 1024, hopSize = -1, fftSize = -1, padding = 1, freeWhenDone = true, action|
+    *process { |server, source, startFrame = 0, numFrames = -1, startChan = 0, numChans = -1, features, select, algorithm = 2, minFreq = 20, maxFreq = 10000, unit = 0, windowSize = 1024, hopSize = -1, fftSize = -1, padding = 1, freeWhenDone = true, action|
 
         var maxFFTSize = if (fftSize == -1) {windowSize.nextPowerOfTwo} {fftSize};
 
+        var selectbits  =  select !? {this.prProcessSelect(select)} ?? {this.prProcessSelect(this.features)};
+
         source = source.asUGenInput;
         features = features.asUGenInput;
 
@@ -27,13 +51,15 @@ FluidBufPitch : FluidBufProcessor{
 		^this.new(
 			server, nil, [features]
 		).processList(
-			[source, startFrame, numFrames, startChan, numChans, features, padding, algorithm, minFreq, maxFreq, unit, windowSize, hopSize, fftSize, maxFFTSize, 0], freeWhenDone, action
+			[source, startFrame, numFrames, startChan, numChans, features, padding, selectbits, algorithm, minFreq, maxFreq, unit, windowSize, hopSize, fftSize, maxFFTSize, 0], freeWhenDone, action
 		);
 	}
 
-    *processBlocking { |server, source, startFrame = 0, numFrames = -1, startChan = 0, numChans = -1, features,  algorithm = 2, minFreq = 20, maxFreq = 10000, unit = 0, windowSize = 1024, hopSize = -1, fftSize = -1, padding = 1, freeWhenDone = true, action|
+    *processBlocking { |server, source, startFrame = 0, numFrames = -1, startChan = 0, numChans = -1, features,  select, algorithm = 2, minFreq = 20, maxFreq = 10000, unit = 0, windowSize = 1024, hopSize = -1, fftSize = -1, padding = 1, freeWhenDone = true, action|
 
         var maxFFTSize = if (fftSize == -1) {windowSize.nextPowerOfTwo} {fftSize};
+        
+        var selectbits  =  select !? {this.prProcessSelect(select)} ?? {this.prProcessSelect(this.features)};
 
         source = source.asUGenInput;
         features = features.asUGenInput;
@@ -44,7 +70,7 @@ FluidBufPitch : FluidBufProcessor{
 		^this.new(
 			server, nil, [features]
 		).processList(
-			[source, startFrame, numFrames, startChan, numChans, features, padding, algorithm, minFreq, maxFreq, unit, windowSize, hopSize, fftSize, maxFFTSize, 1], freeWhenDone, action
+			[source, startFrame, numFrames, startChan, numChans, features, padding, selectbits, algorithm, minFreq, maxFreq, unit, windowSize, hopSize, fftSize, maxFFTSize, 1], freeWhenDone, action
 		);
 	}
 }
diff --git a/release-packaging/Classes/FluidLoudness.sc b/release-packaging/Classes/FluidLoudness.sc
index f5ca703..4018dc9 100644
--- a/release-packaging/Classes/FluidLoudness.sc
+++ b/release-packaging/Classes/FluidLoudness.sc
@@ -1,15 +1,41 @@
 FluidLoudness : FluidRTMultiOutUGen {
-	*kr { arg in = 0, kWeighting = 1, truePeak = 1, windowSize = 1024, hopSize = 512, maxWindowSize = 16384;
-		^this.multiNew('control', in.asAudioRateInput(this), kWeighting, truePeak, windowSize, hopSize, maxWindowSize);
+
+    const <features=#[\loudness, \peak];
+    classvar featuresLookup;
+
+    *initClass {
+        featuresLookup = Dictionary.with(*this.features.collect{|x,i| x->(1<<i)});
+    }
+
+    *prWarnUnrecognised {|sym| ("WARNING: FluidLoudness -" + sym + "is not a recognised option").postln}
+
+    *prProcessSelect {|a|
+        var bits;
+        a.asBag.countsDo{|item,count,i|
+            if(count > 1) { ("Option '" ++ item ++ "' is repeated").warn};
+        };
+        bits = a.collect{ |sym|
+            (featuresLookup[sym.asSymbol] !? {|x| x} ?? {this.prWarnUnrecognised(sym); 0})
+        }.reduce{|x,y| x | y};
+        ^bits
+    }
+
+	*kr { arg in = 0, select, kWeighting = 1, truePeak = 1, windowSize = 1024, hopSize = 512, maxWindowSize = 16384;
+
+        var selectbits  =  select !? {this.prProcessSelect(select)} ?? {this.prProcessSelect(this.features)};
+
+		^this.multiNew('control', in.asAudioRateInput(this), selectbits, kWeighting, truePeak, windowSize, hopSize, maxWindowSize);
 	}
 
-	init {arg ...theInputs;
+    init {arg ...theInputs;
+        var numChannels;
 		inputs = theInputs;
-		^this.initOutputs(2,rate);
+        numChannels = inputs.at(1).asBinaryDigits.sum;
+		^this.initOutputs(numChannels,rate);
 	}
 
 	checkInputs {
-		if(inputs.at(5).rate != 'scalar') {
+		if(inputs.at(6).rate != 'scalar') {
 			^(": maxwindowSize cannot be modulated.");
 			};
 		^this.checkValidInputs;
diff --git a/release-packaging/Classes/FluidPitch.sc b/release-packaging/Classes/FluidPitch.sc
index 7756d19..da15c3f 100644
--- a/release-packaging/Classes/FluidPitch.sc
+++ b/release-packaging/Classes/FluidPitch.sc
@@ -1,16 +1,42 @@
 FluidPitch : FluidRTMultiOutUGen {
 
-	*kr { arg in = 0, algorithm = 2, minFreq = 20, maxFreq = 10000, unit = 0, windowSize = 1024, hopSize = -1, fftSize = -1, maxFFTSize = -1;
-		^this.multiNew('control', in.asAudioRateInput(this), algorithm, minFreq, maxFreq, unit, windowSize, hopSize, fftSize, maxFFTSize);
+    const <features=#[\pitch, \confidence];
+    classvar featuresLookup;
+
+    *initClass {
+        featuresLookup = Dictionary.with(*this.features.collect{|x,i| x->(1<<i)});
+    }
+
+    *prWarnUnrecognised {|sym| ("WARNING: FluidPitch -" + sym + "is not a recognised option").postln}
+
+    *prProcessSelect {|a|
+        var bits;
+        a.asBag.countsDo{|item,count,i|
+            if(count > 1) { ("Option '" ++ item ++ "' is repeated").warn};
+        };
+        bits = a.collect{ |sym|
+            (featuresLookup[sym.asSymbol] !? {|x| x} ?? {this.prWarnUnrecognised(sym); 0})
+        }.reduce{|x,y| x | y};
+        ^bits
+    }
+
+
+	*kr { arg in = 0, select, algorithm = 2, minFreq = 20, maxFreq = 10000, unit = 0, windowSize = 1024, hopSize = -1, fftSize = -1, maxFFTSize = -1;
+        
+        var selectbits  =  select !? {this.prProcessSelect(select)} ?? {this.prProcessSelect(this.features)};
+        
+		^this.multiNew('control', in.asAudioRateInput(this), selectbits, algorithm, minFreq, maxFreq, unit, windowSize, hopSize, fftSize, maxFFTSize);
 	}
 
 	init {arg ...theInputs;
+        var numChannels;
 		inputs = theInputs;
-		^this.initOutputs(2,rate);
+        numChannels = inputs.at(1).asBinaryDigits.sum;
+		^this.initOutputs(numChannels,rate);
 	}
 
 	checkInputs {
-		if(inputs.at(5).rate != 'scalar') {
+		if(inputs.at(9).rate != 'scalar') {
 			^(": maxFFTSize cannot be modulated.");
 			};
 		^this.checkValidInputs;