diff --git a/src/index.js b/src/index.js
index 7ee7ce7..52b88ce 100644
--- a/src/index.js
+++ b/src/index.js
@@ -42,6 +42,11 @@ function AudioEngine (sounds) {
 
     this.setInstrument(0);
 
+    // tempo in bpm (beats per minute)
+    // default is 60bpm
+
+    this.currentTempo = 60;
+
     // theremin setup
 
     this.theremin = new Tone.Synth();
@@ -224,6 +229,16 @@ AudioEngine.prototype.changeVolume = function (value) {
     this.effectsNode.gain.value = this._clamp(newVol, 0, 1);
 };
 
+AudioEngine.prototype.setTempo = function (value) {
+    var newTempo = this._clamp(value, 10, 1000);
+    this.currentTempo = newTempo;
+};
+
+AudioEngine.prototype.changeTempo = function (value) {
+    var newTempo = this._clamp(this.currentTempo + value, 10, 1000);
+    this.currentTempo = newTempo;
+};
+
 AudioEngine.prototype._clamp = function (input, min, max) {
     return Math.min(Math.max(input, min), max);
 };