From 2cc0523f9af9d8cc57b1b575e0aef4e3ce28497f Mon Sep 17 00:00:00 2001
From: Shigeru KANEMOTO <sgk@switch-science.com>
Date: Thu, 18 Aug 2016 22:00:43 +0900
Subject: [PATCH 1/2] Fix changeTempo() calculation

---
 libs/microbit/music.ts | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/libs/microbit/music.ts b/libs/microbit/music.ts
index 7e170ce0..44ed087d 100644
--- a/libs/microbit/music.ts
+++ b/libs/microbit/music.ts
@@ -162,7 +162,7 @@ namespace music {
     //% help=music/change-tempo weight=39
     //% blockId=device_change_tempo block="change tempo by (bpm)|%value" blockGap=8
     export function changeTempoBy(bpm: number): void {
-        setTempo(beat(BeatFraction.Whole) + bpm);
+        setTempo(beatsPerMinute + bpm);
     }
 
     /**

From b24b65abcd97a11b9c1d56bed9087414de9de33a Mon Sep 17 00:00:00 2001
From: Shigeru KANEMOTO <sgk@switch-science.com>
Date: Thu, 18 Aug 2016 22:19:03 +0900
Subject: [PATCH 2/2] Call `init()` before using `beatsPerMinute`.

---
 libs/microbit/music.ts | 1 +
 1 file changed, 1 insertion(+)

diff --git a/libs/microbit/music.ts b/libs/microbit/music.ts
index 44ed087d..dad35efd 100644
--- a/libs/microbit/music.ts
+++ b/libs/microbit/music.ts
@@ -162,6 +162,7 @@ namespace music {
     //% help=music/change-tempo weight=39
     //% blockId=device_change_tempo block="change tempo by (bpm)|%value" blockGap=8
     export function changeTempoBy(bpm: number): void {
+	init();
         setTempo(beatsPerMinute + bpm);
     }