Add True Peak Safety Gain

Util/Audio/OfflineAudioMixer.cs

@@ -116,6 +116,10 @@ namespace ADOFAIRenderer.Util.Audio
             var hardClip = new HardClip();
             hardClip.Initialize(_targetSampleRate, _targetChannels);
             _filters.AddLast(hardClip);
+
+            var truePeakSafetyGain = new Gain { Level = -1f };
+            truePeakSafetyGain.Initialize(_targetSampleRate, _targetChannels);
+            _filters.AddLast(truePeakSafetyGain);
         }
 
         public void InitializeBGM(AudioClip? clip)