diff --git a/Tone/component/Filter.js b/Tone/component/Filter.js
index d9b4981c..715f1a83 100644
--- a/Tone/component/Filter.js
+++ b/Tone/component/Filter.js
@@ -171,11 +171,13 @@ define(["Tone/core/Tone", "Tone/signal/Signal"], function(Tone){
 		}
 		this.frequency.dispose();
 		this.Q.dispose();
+		this.detune.dispose();
 		this.gain.dispose();
 		this._filters = null;
 		this.frequency = null;
 		this.Q = null;
 		this.gain = null;
+		this.detune = null;
 	};
 
 	return Tone.Filter;
diff --git a/Tone/instrument/DuoSynth.js b/Tone/instrument/DuoSynth.js
index 019b097d..f46d4aa5 100644
--- a/Tone/instrument/DuoSynth.js
+++ b/Tone/instrument/DuoSynth.js
@@ -220,7 +220,7 @@ function(Tone){
 	/**
 	 *  clean up
 	 */
-	Tone.DuoSynth.dispose = function(){
+	Tone.DuoSynth.prototype.dispose = function(){
 		Tone.Monophonic.prototype.dispose.call(this);
 		this.voice0.dispose();
 		this.voice1.dispose();
diff --git a/Tone/instrument/FMSynth.js b/Tone/instrument/FMSynth.js
index 7ab4e5f7..fcfa54b6 100644
--- a/Tone/instrument/FMSynth.js
+++ b/Tone/instrument/FMSynth.js
@@ -177,7 +177,7 @@ function(Tone){
 	/**
 	 *  clean up
 	 */
-	Tone.FMSynth.dispose = function(){
+	Tone.FMSynth.prototype.dispose = function(){
 		Tone.Monophonic.prototype.dispose.call(this);
 		this.carrier.dispose();
 		this.modulator.dispose();
diff --git a/Tone/instrument/MonoSynth.js b/Tone/instrument/MonoSynth.js
index e2721cec..14bca543 100644
--- a/Tone/instrument/MonoSynth.js
+++ b/Tone/instrument/MonoSynth.js
@@ -155,14 +155,15 @@ function(Tone){
 		this.envelope.dispose();
 		this.filterEnvelope.dispose();
 		this.filter.dispose();
-		this.detune.dispose();
-		this._unison.dispose();
+		this._amplitude.disconnect();
 		this.oscillator = null;
 		this.filterEnvelope = null;
 		this.envelope = null;
 		this.filter = null;
 		this.detune = null;
-		this._unison = null;
+		this._amplitude = null;
+		this.frequency = null;
+		this.detune = null;
 	};
 
 	return Tone.MonoSynth;
diff --git a/Tone/instrument/MultiSampler.js b/Tone/instrument/MultiSampler.js
index 14922223..d374f158 100644
--- a/Tone/instrument/MultiSampler.js
+++ b/Tone/instrument/MultiSampler.js
@@ -122,12 +122,13 @@ function(Tone){
 	/**
 	 *  clean up
 	 */
-	Tone.MultiSampler.dispose = function(){
+	Tone.MultiSampler.prototype.dispose = function(){
 		Tone.prototype.dispose.call(this);
 		for (var samp in this.samples){
 			this.samples[samp].dispose();
 			this.samples[samp] = null;
 		}
+		this.samples = null;
 	};
 
 	return Tone.MultiSampler;
diff --git a/test/test.js b/test/test.js
index dd4f7319..0809b31a 100644
--- a/test/test.js
+++ b/test/test.js
@@ -30,8 +30,8 @@ function wasDisposed(obj, expect){
 }
 
 var allTests = ["tests/Core", "tests/Timing", "tests/Signal", "tests/SignalComparison", 
-"tests/SignalMath", "tests/Transport", "tests/Sources", "tests/Components", "tests/Effect"];
-// var allTests = ["tests/Core", "tests/SignalComparison"];
+"tests/SignalMath", "tests/Transport", "tests/Sources", "tests/Components", "tests/Effect", "tests/Instruments"];
+// var allTests = ["tests/Core", "tests/Instruments"];
 
 require(allTests, function(){
 	mocha.run(); 
diff --git a/test/tests/Instruments.js b/test/tests/Instruments.js
new file mode 100644
index 00000000..8128bcfb
--- /dev/null
+++ b/test/tests/Instruments.js
@@ -0,0 +1,56 @@
+/* global it, describe, wasDisposed */
+
+define(["tests/Core", "chai", "Tone/instrument/DuoSynth", "Tone/instrument/MonoSynth", "Tone/instrument/FMSynth",
+	"Tone/instrument/PolySynth", "Tone/instrument/Sampler", "Tone/instrument/MultiSampler"], 
+function(Tone, chai, DuoSynth, MonoSynth, FMSynth, PolySynth, Sampler, MultiSampler){
+
+	var expect = chai.expect;
+
+	describe("Tone.MonoSynth", function(){
+		it("can be created and disposed", function(){
+			var ms = new MonoSynth();
+			ms.dispose();
+			wasDisposed(ms, expect);
+		});
+	});
+
+	describe("Tone.DuoSynth", function(){
+		it("can be created and disposed", function(){
+			var ds = new DuoSynth();
+			ds.dispose();
+			wasDisposed(ds, expect);
+		});
+	});
+
+	describe("Tone.FMSynth", function(){
+		it("can be created and disposed", function(){
+			var fms = new FMSynth();
+			fms.dispose();
+			wasDisposed(fms, expect);
+		});
+	});
+
+	describe("Tone.PolySynth", function(){
+		it("can be created and disposed", function(){
+			var ps = new PolySynth();
+			ps.dispose();
+			wasDisposed(ps, expect);
+		});
+	});
+
+	describe("Tone.Sampler", function(){
+		it("can be created and disposed", function(){
+			var samp = new Sampler();
+			samp.dispose();
+			wasDisposed(samp, expect);
+		});
+	});
+
+	describe("Tone.MultiSampler", function(){
+		it("can be created and disposed", function(){
+			var samp = new MultiSampler();
+			samp.dispose();
+			wasDisposed(samp, expect);
+		});
+	});
+});
\ No newline at end of file