Add pan effect

src/uk/co/majenko/audiobookrecorder/Pan.java

@@ -0,0 +1,52 @@
+package uk.co.majenko.audiobookrecorder;
+
+import java.util.ArrayList;
+
+public class Pan implements Effect {
+    double pan;
+    public Pan() {
+        pan = 0.0d;
+    }
+    public Pan(double p) {
+        pan = p;
+    }
+
+    public String getName() {
+        return "Pan (" + pan + ")";
+    }
+
+    public ArrayList<Effect> getChildEffects() {
+        return null;
+    }
+
+    public void process(Sample[] samples) {
+        for (Sample sample : samples) {
+            if (pan < 0) {
+                double p = 1 + pan;
+                sample.right *= p;
+            } else {
+                double p = 1 - pan;
+                sample.left *= p;
+            }
+        }
+    }
+
+    public double getPan() {
+        return pan;
+    }
+   
+    public void setPan(double p) {
+        pan = p;
+    }
+
+    public String toString() {
+        return getName();
+    }
+
+    public void dump() {
+        System.out.println(toString());
+    }
+
+    public void init(double sf) {
+    }
+}