diff --git a/js/expo.js b/js/expo.js
index 9b4ca621..80b8e47e 100644
--- a/js/expo.js
+++ b/js/expo.js
@@ -7,12 +7,16 @@
  */
 function ExpoCurve(offset, power, inputRange, outputRange, steps) {
     var
-        curve, inputScale;
+        curve, inputScale, rawInputScale;
     
     function lookupStraightLine(input) {
         return (input + offset) * inputScale;
     }
 
+    this.lookupRaw = function(input) {
+        return (input + offset) * rawInputScale;
+    }
+
     /**
      * An approximation of lookupMathPow by precomputing several expo curve points and interpolating between those
      * points using straight line interpolation.
@@ -58,6 +62,8 @@ function ExpoCurve(offset, power, inputRange, outputRange, steps) {
         return result;
     }
     
+    rawInputScale = outputRange / inputRange;
+
     // If steps argument isn't supplied, use a reasonable default
     if (steps === undefined) {
         steps = 12;
diff --git a/js/graph_spectrum.js b/js/graph_spectrum.js
index b6bb1979..ae2ad76d 100644
--- a/js/graph_spectrum.js
+++ b/js/graph_spectrum.js
@@ -53,7 +53,7 @@ function dataLoad(chunks, startFrameIndex, fieldIndex, curve, buffer) {
             var chunk = chunks[chunkIndex];
             for (; frameIndex < chunk.frames.length; frameIndex++) {
             	var fieldValue = chunk.frames[frameIndex][fieldIndex];
-                bufferData[i++] = (curve.lookup(fieldValue));
+                bufferData[i++] = (curve.lookupRaw(fieldValue));
 
                 if (i >= buffer.length)
                     break dataCollectionLoop;
@@ -91,7 +91,7 @@ function draw() {
       canvasCtx.fillStyle = 'rgba(255, 255, 255, .25)'; /* white */
       canvasCtx.fillRect(0, 0, WIDTH, HEIGHT);
       
-      var barWidth = (WIDTH / PLOTTED_BUFFER_LENGTH);// * 2.5;
+      var barWidth = (WIDTH / PLOTTED_BUFFER_LENGTH) - 1;// * 2.5;
       var barHeight;
       var x = 0;
       
@@ -101,17 +101,43 @@ function draw() {
         canvasCtx.fillStyle = 'rgba(0,255,0,0.3)'; /* green */
         canvasCtx.fillRect(x,HEIGHT-barHeight,barWidth,barHeight);
 
-        x += barWidth;
+        x += barWidth + 1;
       }
-      drawAxisLabel('#' + leftPad(audioIterations, "0", 7), WIDTH - 8, HEIGHT - 10);
+      drawGridLines(options.analyserSampleRate, LEFT, TOP, WIDTH, HEIGHT);
+      drawAxisLabel('#' + leftPad(audioIterations, "0", 7), WIDTH - 8, HEIGHT - 10, 'right');
 	  canvasCtx.restore();
 	}
 
+function drawGridLines(sampleRate, LEFT, TOP, WIDTH, HEIGHT) {
+
+	var ticks = 5;
+	var frequencyInterval = (sampleRate / ticks) / 4;
+	var frequency = 0;
+
+	for(var i=0; i<=ticks; i++) {
+		    canvasCtx.beginPath();
+            canvasCtx.lineWidth = 1;
+            canvasCtx.strokeStyle = "rgba(255,255,255,0.25)";
+            
+            canvasCtx.moveTo(i * (WIDTH / ticks), 0);
+            canvasCtx.lineTo(i * (WIDTH / ticks), HEIGHT);
+            
+            canvasCtx.stroke();
+            drawAxisLabel((frequency)+"Hz", i * (WIDTH / ticks), HEIGHT * 1.05, 'center');
+			frequency += frequencyInterval;
+	}	
+}
 
-function drawAxisLabel(axisLabel, X, Y) {
+function drawAxisLabel(axisLabel, X, Y, align) {
         canvasCtx.font = drawingParams.fontSizeFrameLabel + "pt " + DEFAULT_FONT_FACE;
         canvasCtx.fillStyle = "rgba(255,255,255,0.9)";
-        canvasCtx.textAlign = 'right';
+		if(align) {
+			 canvasCtx.textAlign = align;
+			 } else 
+			 {
+			 canvasCtx.textAlign = 'center';
+			 }
+
         
         canvasCtx.fillText(axisLabel, X, Y);
     }
diff --git a/js/grapher.js b/js/grapher.js
index f52a5a67..1e15facd 100755
--- a/js/grapher.js
+++ b/js/grapher.js
@@ -53,7 +53,8 @@ function FlightLogGrapher(flightLog, graphConfig, canvas, craftCanvas, options)
         defaultOptions = {
             gapless:false,
             drawCraft:"3D", drawPidTable:true, drawSticks:true, drawTime:true,
-            drawAnalyser:true,    // add an analyser option
+            drawAnalyser:true,              // add an analyser option
+            analyserSampleRate:2000/*Hz*/,  // the loop time for the log
             eraseBackground: true // Set to false if you want the graph to draw on top of an existing canvas image
         },