diff --git a/.eslintrc.json b/.eslintrc.json
index c78da4c..e96b061 100644
--- a/.eslintrc.json
+++ b/.eslintrc.json
@@ -1,7 +1,8 @@
 {
     "extends": "eslint-config-fluid",
     "env": {
-        "node": true
+        "node": true,
+        "es6": true
     },
     "rules": {
         "dot-notation": [
diff --git a/package.json b/package.json
index dbfaea0..d02a668 100644
--- a/package.json
+++ b/package.json
@@ -23,7 +23,7 @@
         "electron": "17.4.0",
         "electron-icon-builder": "2.0.1",
         "electron-packager": "15.4.0",
-        "fluid-lint-all": "1.1.5",
+        "fluid-lint-all": "1.2.2",
         "node-jqunit": "1.1.9"
     },
     "dependencies": {
diff --git a/src/renderer-process/css/score-panel.css b/src/renderer-process/css/score-panel.css
index 4ff81b1..9a208e5 100644
--- a/src/renderer-process/css/score-panel.css
+++ b/src/renderer-process/css/score-panel.css
@@ -15,11 +15,11 @@
 }
 
 .bubbles-osc-panel {
+    border-bottom: 0.1em solid #aaa;
     color: #fff;
     font-family: sans-serif;
     font-size: 0.8em;
     font-weight: 600;
     opacity: 1;
     padding: 0 0.5em 1.5em 0.5em;
-    border-bottom: 0.1em solid #aaa;
 }
diff --git a/src/renderer-process/js/modulation-matrix-view.js b/src/renderer-process/js/modulation-matrix-view.js
index 88ef69c..a22437a 100644
--- a/src/renderer-process/js/modulation-matrix-view.js
+++ b/src/renderer-process/js/modulation-matrix-view.js
@@ -7,6 +7,8 @@ https://github.com/colinbdclark/bubbles/raw/master/LICENSE
 
 "use strict";
 
+var bubbles = fluid.registerNamespace("bubbles");
+
 fluid.defaults("bubbles.modulationMatrixView", {
     gradeNames: "fluid.containerRenderingView",
 
diff --git a/src/renderer-process/js/osc-relayer.js b/src/renderer-process/js/osc-relayer.js
index 7a63090..e2dea0c 100644
--- a/src/renderer-process/js/osc-relayer.js
+++ b/src/renderer-process/js/osc-relayer.js
@@ -7,8 +7,6 @@ https://github.com/colinbdclark/bubbles/raw/master/LICENSE
 
 "use strict";
 
-var bubbles = fluid.registerNamespace("bubbles");
-
 fluid.defaults("bubbles.oscRelayer", {
     gradeNames: "fluid.modelComponent",
 
diff --git a/src/renderer-process/js/osc-source.js b/src/renderer-process/js/osc-source.js
index 4448d73..a0c0b50 100644
--- a/src/renderer-process/js/osc-source.js
+++ b/src/renderer-process/js/osc-source.js
@@ -27,7 +27,7 @@ fluid.defaults("bubbles.oscSource", {
     },
 
     model: {
-        isListening: false,
+        isListening: false
         /*
         gain: 1.0,
         layers: {
diff --git a/src/renderer-process/shaders/bubbles.frag b/src/renderer-process/shaders/bubbles.frag
index abb843e..6280a34 100644
--- a/src/renderer-process/shaders/bubbles.frag
+++ b/src/renderer-process/shaders/bubbles.frag
@@ -17,11 +17,20 @@ uniform float saturation[MAX_LAYERS];
 uniform sampler2D samplers[MAX_LAYERS];
 uniform vec2 textureSize;
 
+float clampUnipolar (float value) {
+    if (value < 0.0) {
+        value = 0.0;
+    }
+
+    return value;
+}
+
 float luma (vec3 fragment) {
     return dot(fragment, W);
 }
 
-vec3 brightnessContrast (vec3 fragment, float brightness, float contrast) {
+vec3 brightnessContrast (vec3 fragment, float brightness,
+    float contrast) {
     return (fragment - 0.5) * contrast + 0.5 + brightness;
 }
 
@@ -52,15 +61,18 @@ void main(void) {
         colour = brightnessContrast(colour, brightness[i], contrast[i]);
 
         // 2. Scale colour channels.
-        vec3 colourScale = vec3(redScale[i], greenScale[i],
-            blueScale[i]);
+        vec3 colourScale = vec3(
+            clampUnipolar(redScale[i]),
+            clampUnipolar(greenScale[i]),
+            clampUnipolar(blueScale[i]));
+
         colour = colour * colourScale;
 
         // 3. Apply saturation.
         colour = saturate(colour, saturation[i]);
 
         // 4. Adjust overall opacity
-        colour = colour * opacity[i];
+        colour = colour * clampUnipolar(opacity[i]);
 
         // 5. Apply luma key.
         // TODO: Add some smoothstepping.
@@ -69,10 +81,10 @@ void main(void) {
             // 6. Sum pixel with other layers if it isn't keyed out.
             layerSum = layerSum + colour;
         }
-
-        // 7. Apply gain to all layers.
-        layerSum = layerSum * gain;
     }
 
+    // 7. Apply gain to all layers.
+    layerSum = layerSum * clampUnipolar(gain);
+
     gl_FragColor = vec4(layerSum.r, layerSum.g, layerSum.b, 1.0);
 }
diff --git a/tests/js/main-window-tests.js b/tests/js/main-window-tests.js
index 946c043..b2a92c0 100644
--- a/tests/js/main-window-tests.js
+++ b/tests/js/main-window-tests.js
@@ -16,7 +16,26 @@ fluid.defaults("bubbles.tests.mainWindowTestEnvironment", {
 
     components: {
         app: {
-            type: "bubbles.app"
+            type: "bubbles.app",
+            options: {
+                components: {
+                    mainWindow: {
+                        options: {
+                            model: {
+                                url: {
+                                    expander: {
+                                        funcName: "fluid.stringTemplate",
+                                        args: [
+                                            "%url/../src/renderer-process/html/main-window.html",
+                                            "{app}.env.appRoot"
+                                        ]
+                                    }
+                                }
+                            }
+                        }
+                    }
+                }
+            }
         },
 
         tester: {