diff --git a/src/InstrumentPlayer.js b/src/InstrumentPlayer.js
index cee8cb3..ec0896c 100644
--- a/src/InstrumentPlayer.js
+++ b/src/InstrumentPlayer.js
@@ -15,11 +15,11 @@ function InstrumentPlayer (outputNode) {
     this.instruments = [];
 }
 
-InstrumentPlayer.prototype.playNoteForBeatsWithInstrument = function (note, beats, instrumentNum) {
+InstrumentPlayer.prototype.playNoteForSecsWithInst = function (note, sec, instrumentNum) {
     this.loadInstrument(instrumentNum)
         .then(() => {
             this.instruments[instrumentNum].play(
-                note, Tone.context.currentTime, {duration : Number(beats)} // todo: need to use tempo here
+                note, Tone.context.currentTime, {duration : sec}
             );
         });
 };
diff --git a/src/index.js b/src/index.js
index d56b831..6e43cd8 100644
--- a/src/index.js
+++ b/src/index.js
@@ -114,7 +114,8 @@ AudioPlayer.prototype.playSound = function (index) {
 };
 
 AudioPlayer.prototype.playNoteForBeats = function (note, beats) {
-    this.audioEngine.instrumentPlayer.playNoteForBeatsWithInstrument(note, beats, this.currentInstrument);
+    var sec = this.beatsToSec(beats);
+    this.audioEngine.instrumentPlayer.playNoteForSecsWithInst(note, sec, this.currentInstrument);
     return this.waitForBeats(beats);
 };