set osc phase based on this.f and update phase when freq is changed

Author: therewasaguy

lib/p5.sound.js

@@ -1,4 +1,4 @@
-/*! p5.sound.js v0.2.16 2015-11-30 */
+/*! p5.sound.js v0.2.16 2015-12-06 */
 (function (root, factory) {
   if (typeof define === 'function' && define.amd)
     define('p5.sound', ['p5'], function (p5) { (factory(p5));});
@@ -3612,6 +3612,7 @@ oscillator = function () {
     }
     this.started = false;
     // components
+    this.phaseAmount = undefined;
     this.oscillator = p5sound.audiocontext.createOscillator();
     this.f = freq || 440;
     // frequency
@@ -3762,6 +3763,10 @@ oscillator = function () {
       } else {
         this.oscillator.frequency.linearRampToValueAtTime(val, tFromNow + rampTime + now);
       }
+      // reset phase if oscillator has a phase
+      if (this.phaseAmount) {
+        this.phase(this.phaseAmount);
+      }
     } else if (val) {
       if (val.output) {
         val = val.output;
@@ -3849,23 +3854,27 @@ oscillator = function () {
     }
   };
   /**
-   *  Set the phase of an oscillator between 0.0 and 1.0
+   *  Set the phase of an oscillator between 0.0 and 1.0.
+   *  In this implementation, phase is a delay time
+   *  based on the oscillator's current frequency.
    *  
    *  @method  phase
    *  @param  {Number} phase float between 0.0 and 1.0
    */
   p5.Oscillator.prototype.phase = function (p) {
+    var delayAmt = p5.prototype.map(p, 0, 1, 0, 1 / this.f);
+    var now = p5sound.audiocontext.currentTime;
+    this.phaseAmount = p;
     if (!this.dNode) {
       // create a delay node
       this.dNode = p5sound.audiocontext.createDelay();
       // put the delay node in between output and panner
-      this.output.disconnect();
-      this.output.connect(this.dNode);
-      this.dNode.connect(this.panner);
+      this.oscillator.disconnect();
+      this.oscillator.connect(this.dNode);
+      this.dNode.connect(this.output);
     }
-    // set delay time based on PWM width
-    var now = p5sound.audiocontext.currentTime;
-    this.dNode.delayTime.linearRampToValueAtTime(p5.prototype.map(p, 0, 1, 0, 1 / this.oscillator.frequency.value), now);
+    // set delay time to match phase:
+    this.dNode.delayTime.setValueAtTime(delayAmt, now);
   };
   // ========================== //
   // SIGNAL MATH FOR MODULATION //