Fix tempo changes (#8)

* fix tempo changes

* Update version history

---------

Co-authored-by: Emmett Lin <emmett@linbarbell.com>
Co-authored-by: RShields <playnow254@gmail.com>

Author: 3 people

index.html

@@ -285,6 +285,10 @@ <h3>Examples</h3>
 
   <div class="container">
     <h2>Version history</h2>
+    <p>
+      v1.9b<br>
+      Fixed an issue where tempo changes were applied at the wrong time
+    </p>
     <p>
       v1.9a<br>
       Increased maximum pitch bend range to 12 semitones

src/midiToNotes.js

@@ -251,14 +251,13 @@ const MidiToNotes = (function () {
     let currTime = 0;
 
     for (const event of sortedMidiEvents) {
+      let adjustedDeltaTime = event.deltaTime * currTempo / baseTempo;
+      currTime += adjustedDeltaTime;
+      event.time = currTime;
       if (getEventType(event) === "meta" && event.metaType === 81) {
         if (event.time === 0) baseTempo = event.data;
         currTempo = event.data;
       }
-
-      let adjustedDeltaTime = event.deltaTime * currTempo / baseTempo;
-      currTime += adjustedDeltaTime;
-      event.time = currTime;
     }
   }