diff --git a/flexFX.ts b/flexFX.ts
index 34a9581..66b6d98 100644
--- a/flexFX.ts
+++ b/flexFX.ts
@@ -862,7 +862,7 @@ namespace flexFX {
     //% group="Play-list"
     //% weight=210
     export function setNextTempo(bpm: number) {
-        tickMs = 60000/bpm;
+        tickMs = 15000/bpm; // = (60*1000) / (4*bpm)
     }
 
 
diff --git a/pxt.json b/pxt.json
index 0c01c6f..8c4fb79 100644
--- a/pxt.json
+++ b/pxt.json
@@ -9,8 +9,7 @@
         "flexFX.ts",
         "README.md",
         "tutorial-info-cache.json",
-        "main.ts",
-        "temp.md"
+        "main.ts"
     ],
     "testFiles": [
         "test.ts"
diff --git a/test.ts b/test.ts
index 0347060..1647caa 100644
--- a/test.ts
+++ b/test.ts
@@ -186,15 +186,19 @@ pause(2000);
  
 // check asynchrony of tunes
 basic.showIcon(IconNames.Target);
-flexFX.playTune("birthday", "hum", false, 200, 6000, -24);
+flexFX.playTune("birthday", "hum", false, 200, 12000, -5);
 basic.showNumber(flexFX.waitingToPlay());
 pause(1000);
 flexFX.startPlaying();
 while (flexFX.isActive()) {
     images.iconImage(IconNames.StickFigure).showImage(-1, 150);
+    pause(200);
     images.iconImage(IconNames.StickFigure).showImage(0, 150);
+    pause(200);
     images.iconImage(IconNames.StickFigure).showImage(1, 150);
+    pause(200);
     images.iconImage(IconNames.StickFigure).showImage(0, 150);
+    pause(200);
 }
 
 basic.showIcon(IconNames.Yes);