Changed the usual music volume to match the usual sound effect volume.

LICENSES

@@ -540,6 +540,7 @@ music/through_space.ogg
 Author: maxstack <http://opengameart.org/users/maxstack>
 License: CC BY-SA 3.0 <http://creativecommons.org/licenses/by-sa/3.0/>
 Source: http://opengameart.org/content/through-space
+Changes: Amplified +1 dB and rate changed from 48000 to 44100 in Audacity.
 
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@@ -564,6 +565,7 @@ music/frozen_jam.ogg
 Author: tgfcoder <https://twitter.com/tgfcoder>
 License: CC BY 3.0 <http://creativecommons.org/licenses/by/3.0/>
 Source: http://opengameart.org/content/frozen-jam-seamless-loop
+Changes: Amplified -1 dB with Audacity
 
 ------------------------------------------------------------------------
 
@@ -588,7 +590,7 @@ music/RE.ogg
 Author: WeskerHunter <http://redeclipse.net/forum/viewtopic.php?f=5&t=26>
 License: CC BY-SA 3.0 <http://creativecommons.org/licenses/by-sa/3.0/>
 Source: http://opengameart.org/content/fast-high-music
-Details: Slowed down 5% with Audacity
+Changes: Amplified -1 dB and slowed down 5% with Audacity
 
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@@ -604,4 +606,5 @@ music/rise_of_spirit.ogg
 
 Author: Alexandr Zhelanov <https://soundcloud.com/alexandr-zhelanov>
 License: CC BY 3.0 <http://creativecommons.org/licenses/by/3.0/>
-Source: http://opengameart.org/content/rise-of-spirit
+Source: http://opengameart.org/content/rise-of-spirit
+Changes: Amplified +6 dB with Audacity

src/init.cpp

@@ -44,7 +44,7 @@ void initVars()
 
 	if (engine.useAudio)
 	{
-		Mix_Volume(-1, 50);
+		Mix_Volume(-1, 100);
 		Mix_VolumeMusic((int)engine.musicVolume);
 	}
 }