From 5dfa4cc6910eea375b3ce4a4321e7e720fcd382c Mon Sep 17 00:00:00 2001
From: Eric Rosenbaum <eric.rosenbaum@gmail.com>
Date: Fri, 31 Aug 2018 10:47:36 -0400
Subject: [PATCH] Text2speech set gain to 2 (6db)

---
 src/extensions/scratch3_text2speech/index.js | 11 ++++++++++-
 1 file changed, 10 insertions(+), 1 deletion(-)

diff --git a/src/extensions/scratch3_text2speech/index.js b/src/extensions/scratch3_text2speech/index.js
index 393c3084..fd023d99 100644
--- a/src/extensions/scratch3_text2speech/index.js
+++ b/src/extensions/scratch3_text2speech/index.js
@@ -337,9 +337,18 @@ class Scratch3SpeakBlocks {
                     }
                 };
                 this.runtime.audioEngine.decodeSoundPlayer(sound).then(soundPlayer => {
-                    soundPlayer.connect(this.runtime.audioEngine);
+                    const context = this.runtime.audioEngine.audioContext;
                     soundPlayer.setPlaybackRate(playbackRate);
                     soundPlayer.play();
+
+                    // Increase the loudness of the speech sound
+                    const gainNode = context.createGain();
+                    gainNode.gain.setValueAtTime(2, context.currentTime);
+                    // Note that this connect must be done after play is called,
+                    // which initializes the soundPlayer's output node.
+                    soundPlayer.outputNode.connect(gainNode);
+                    gainNode.connect(this.runtime.audioEngine.inputNode);
+
                     soundPlayer.on('stop', resolve);
                 });
             });