diff --git a/src/demo/demo.cc b/src/demo/demo.cc
index b30c23d..6e82204 100644
--- a/src/demo/demo.cc
+++ b/src/demo/demo.cc
@@ -109,10 +109,10 @@ bool Demo::Initialize() {
   }
 
   music_.SetSound("music");
-  music_.SetMaxAplitude(0.5f);
+  music_.SetMaxAmplitude(0.5f);
 
   boss_music_.SetSound("boss_music");
-  boss_music_.SetMaxAplitude(0.5f);
+  boss_music_.SetMaxAmplitude(0.5f);
 
   if (!saved_data_.root().get("audio", Json::Value(true)).asBool())
     Engine::Get().SetEnableAudio(false);
diff --git a/src/demo/enemy.cc b/src/demo/enemy.cc
index 9c34824..ed36ece 100644
--- a/src/demo/enemy.cc
+++ b/src/demo/enemy.cc
@@ -734,29 +734,29 @@ void Enemy::SpawnUnit(EnemyType enemy_type,
     e.explosion.SetSound("powerup-pick");
 
     e.spawn.SetSound("powerup-spawn");
-    e.spawn.SetMaxAplitude(2.0f);
+    e.spawn.SetMaxAmplitude(2.0f);
     e.spawn.Play(false);
   } else {
     e.explosion.SetSound("explosion");
     e.explosion.SetVariate(true);
     e.explosion.SetSimulateStereo(true);
-    e.explosion.SetMaxAplitude(0.9f);
+    e.explosion.SetMaxAmplitude(0.9f);
   }
 
   e.stealth.SetSound("stealth");
   e.stealth.SetVariate(false);
   e.stealth.SetSimulateStereo(false);
-  e.stealth.SetMaxAplitude(0.7f);
+  e.stealth.SetMaxAmplitude(0.7f);
 
   e.shield_on.SetSound("shield");
   e.shield_on.SetVariate(false);
   e.shield_on.SetSimulateStereo(false);
-  e.shield_on.SetMaxAplitude(0.5f);
+  e.shield_on.SetMaxAmplitude(0.5f);
 
   e.hit.SetSound("hit");
   e.hit.SetVariate(true);
   e.hit.SetSimulateStereo(false);
-  e.hit.SetMaxAplitude(0.5f);
+  e.hit.SetMaxAmplitude(0.5f);
 }
 
 void Enemy::SpawnBoss() {
@@ -834,7 +834,7 @@ void Enemy::SpawnBoss() {
     e.hit.SetSound("hit");
     e.hit.SetVariate(true);
     e.hit.SetSimulateStereo(false);
-    e.hit.SetMaxAplitude(0.5f);
+    e.hit.SetMaxAmplitude(0.5f);
   });
   boss_animator_.Play(Animator::kFrames, true);
   boss_animator_.Play(Animator::kMovement, false);
diff --git a/src/demo/menu.cc b/src/demo/menu.cc
index fb79e5a..65bb522 100644
--- a/src/demo/menu.cc
+++ b/src/demo/menu.cc
@@ -149,7 +149,7 @@ bool Menu::Initialize() {
   click_.SetSound(click_sound_);
   click_.SetVariate(false);
   click_.SetSimulateStereo(false);
-  click_.SetMaxAplitude(1.5f);
+  click_.SetMaxAmplitude(1.5f);
 
   logo_[0].Create("logo_tex0", {3, 8});
   logo_[0].SetZOrder(41);
diff --git a/src/demo/player.cc b/src/demo/player.cc
index 2db3220..bebe324 100644
--- a/src/demo/player.cc
+++ b/src/demo/player.cc
@@ -75,7 +75,7 @@ bool Player::Initialize() {
   nuke_explosion_.SetSound("nuke");
   nuke_explosion_.SetVariate(false);
   nuke_explosion_.SetSimulateStereo(false);
-  nuke_explosion_.SetMaxAplitude(0.8f);
+  nuke_explosion_.SetMaxAmplitude(0.8f);
 
   no_nuke_.SetSound("no_nuke");
 
@@ -306,7 +306,7 @@ void Player::SetupWeapons() {
     laser_shot_[i].SetSound("laser");
     laser_shot_[i].SetVariate(true);
     laser_shot_[i].SetSimulateStereo(false);
-    laser_shot_[i].SetMaxAplitude(0.4f);
+    laser_shot_[i].SetMaxAmplitude(0.4f);
   }
 }
 
diff --git a/src/engine/sound_player.cc b/src/engine/sound_player.cc
index 29fea8a..0c8a084 100644
--- a/src/engine/sound_player.cc
+++ b/src/engine/sound_player.cc
@@ -69,7 +69,7 @@ void SoundPlayer::SetSimulateStereo(bool simulate) {
   input_->SetSimulateStereo(simulate);
 }
 
-void SoundPlayer::SetMaxAplitude(float max_amplitude) {
+void SoundPlayer::SetMaxAmplitude(float max_amplitude) {
   max_amplitude_ = max_amplitude;
   input_->SetMaxAmplitude(max_amplitude);
 }
diff --git a/src/engine/sound_player.h b/src/engine/sound_player.h
index 19d3d41..6af7cb5 100644
--- a/src/engine/sound_player.h
+++ b/src/engine/sound_player.h
@@ -32,7 +32,7 @@ class SoundPlayer {
   // Enable or disable stereo simulation effect. Disabled by default.
   void SetSimulateStereo(bool simulate);
 
-  void SetMaxAplitude(float max_amplitude);  // TODO: typo
+  void SetMaxAmplitude(float max_amplitude);
 
   // Set callback to be called once playback stops.
   void SetEndCallback(base::Closure cb);