diff --git a/qb.js b/qb.js
index 5b29654..eceac3a 100644
--- a/qb.js
+++ b/qb.js
@@ -2815,8 +2815,11 @@ var QB = new function() {
         }
     };
 
-    this.sub_Sound = async function(freq, duration, shape) {
-        if (shape == undefined) { shape = "square"; }
+
+    this.sub_Sound = async function(freq, duration, shape, decay, gain) {
+        if (shape == undefined || (typeof shape != 'string')) { shape = "square"; }
+        if (decay == undefined || (typeof decay != 'number')) { decay = 0.0; }
+        if (gain  == undefined || (typeof gain != 'number')) { gain = 1.0; }
         if (!(freq == 0 || (freq >= 32 && freq <= 32767))) {
             throw new Error("Frequency invalid - valid: 0 (delay), 32 to 32767");
         }
@@ -2829,12 +2832,16 @@ var QB = new function() {
         } else {
             var context = new AudioContext();
             var oscillator = context.createOscillator();
+            var gainNode = context.createGain();
             oscillator.type = shape;
             oscillator.frequency.value = freq;
-            oscillator.connect(context.destination);
+            oscillator.connect(gainNode);
+            gainNode.connect(context.destination)
+            gainNode.gain.value = gain;
             oscillator.start(); 
-            setTimeout(await function () {
-                oscillator.stop();
+            setTimeout(await async function () {
+                gainNode.gain.setTargetAtTime(0, context.currentTime, decay);
+                oscillator.stop(duration + decay + 1);
             }, duration);  
         }
     };