Merge pull request #245 from hydrabolt/volume-fixes

Volume fixes

lib/Voice/VolumeTransformer.js

@@ -22,6 +22,19 @@ var Volume = (function (_Transform) {
 		this.set(volume);
 	}
 
+	// Set the volume so that a value of 0.5 is half the perceived volume and
+	// 2.0 is double the perceived volume.
+
+	Volume.prototype.setVolumeLogarithmic = function setVolumeLogarithmic(value) {
+		this.volume = Math.pow(value, 1.660964);
+	};
+
+	// Set the volume to a value specified as decibels.
+
+	Volume.prototype.setVolumeDecibels = function setVolumeDecibels(db) {
+		this.volume = Math.pow(10, db / 20);
+	};
+
 	Volume.prototype.get = function get() {
 		return this.volume;
 	};
@@ -61,7 +74,7 @@ var Volume = (function (_Transform) {
 	}, {
 		key: 'multiplier',
 		get: function get() {
-			return Math.tan(this.volume);
+			return this.volume;
 		}
 	}]);
 

src/Voice/VolumeTransformer.js

@@ -17,8 +17,19 @@ class Volume extends Transform {
 		this._volume = value;
 	}
 
+	// Set the volume so that a value of 0.5 is half the perceived volume and
+	// 2.0 is double the perceived volume.
+	setVolumeLogarithmic(value) {
+		this.volume = Math.pow(value, 1.660964);
+	}
+
+	// Set the volume to a value specified as decibels.
+	setVolumeDecibels(db) {
+		this.volume = Math.pow(10, db / 20);
+	}
+
 	get multiplier() {
-		return Math.tan(this.volume);
+		return this.volume;
 	}
 
 	get() {