Big refactor in place: Organize nodes in line with dependency injection expectations, use state machine flow more

src/audio/DimmableAudioStreamPlayer.cs

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+namespace GameJamDungeon;
+
+using Chickensoft.GodotNodeInterfaces;
+using Godot;
+
+public interface IDimmableAudioStreamPlayer : IAudioStreamPlayer
+{
+  /// <summary>Fade this dimmable audio stream track in.</summary>
+  public void FadeIn();
+  /// <summary>Fade this dimmable audio stream track out.</summary>
+  public void FadeOut();
+}
+
+public partial class DimmableAudioStreamPlayer :
+  AudioStreamPlayer, IDimmableAudioStreamPlayer
+{
+  #region Constants
+  // -60 to -80 is considered inaudible for decibels.
+  public const float VOLUME_DB_INAUDIBLE = -80f;
+  public const double FADE_DURATION = 3d; // seconds
+  #endregion Constants
+
+  public ITween? FadeTween { get; set; }
+
+  public float InitialVolumeDb;
+
+  public override void _Ready()
+  {
+    InitialVolumeDb = VolumeDb;
+    VolumeDb = VOLUME_DB_INAUDIBLE;
+  }
+
+  public void FadeIn()
+  {
+    SetupFade(InitialVolumeDb, Tween.EaseType.Out);
+    Play();
+  }
+
+  public void FadeOut()
+  {
+    SetupFade(VOLUME_DB_INAUDIBLE, Tween.EaseType.In);
+    FadeTween!.TweenCallback(Callable.From(Stop));
+  }
+
+  public void SetupFade(float volumeDb, Tween.EaseType ease)
+  {
+    FadeTween?.Kill();
+
+    FadeTween = GodotInterfaces.Adapt<ITween>(CreateTween());
+
+    FadeTween.TweenProperty(
+      this,
+      "volume_db",
+      volumeDb,
+      FADE_DURATION
+    ).SetTrans(Tween.TransitionType.Circ).SetEase(ease);
+  }
+}

src/audio/InGameAudio.cs

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+using Chickensoft.AutoInject;
+using Chickensoft.GodotNodeInterfaces;
+using Chickensoft.Introspection;
+using Godot;
+
+namespace GameJamDungeon;
+
+[Meta(typeof(IAutoNode))]
+public partial class InGameAudio : Node
+{
+  public override void _Notification(int what) => this.Notify(what);
+
+  #region BGM Nodes
+  [Node] public IDimmableAudioStreamPlayer MenuBGM { get; set; } = default!;
+  [Node] public IDimmableAudioStreamPlayer OverworldBGM { get; set; } = default!;
+  #endregion
+
+  #region SFX Nodes
+  [Node] public IAudioStreamPlayer PlayerAttackSFX { get; set; } = default!;
+  #endregion
+}

src/audio/InGameAudio.tscn

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+[gd_scene load_steps=3 format=3 uid="uid://b16ejcwanod72"]
+
+[ext_resource type="Script" path="res://src/audio/InGameAudio.cs" id="1_gpmcr"]
+[ext_resource type="Script" path="res://src/audio/DimmableAudioStreamPlayer.cs" id="2_857rw"]
+
+[node name="InGameAudio" type="Node"]
+process_mode = 3
+script = ExtResource("1_gpmcr")
+
+[node name="MenuBGM" type="AudioStreamPlayer" parent="."]
+unique_name_in_owner = true
+script = ExtResource("2_857rw")
+
+[node name="OverworldBGM" type="AudioStreamPlayer" parent="."]
+unique_name_in_owner = true
+script = ExtResource("2_857rw")
+
+[node name="PlayerAttackSFX" type="AudioStreamPlayer" parent="."]
+unique_name_in_owner = true

src/audio/music/crossing-the-gate.mp3.import

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+[remap]
+
+importer="mp3"
+type="AudioStreamMP3"
+uid="uid://d2jrktp06xsba"
+path="res://.godot/imported/crossing-the-gate.mp3-f062dfcb3f59739ce7e55970f8091d25.mp3str"
+
+[deps]
+
+source_file="res://src/audio/music/crossing-the-gate.mp3"
+dest_files=["res://.godot/imported/crossing-the-gate.mp3-f062dfcb3f59739ce7e55970f8091d25.mp3str"]
+
+[params]
+
+loop=false
+loop_offset=0
+bpm=0
+beat_count=0
+bar_beats=4

src/audio/music/droney.mp3.import

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+[remap]
+
+importer="mp3"
+type="AudioStreamMP3"
+uid="uid://dfu0fksb6slhx"
+path="res://.godot/imported/droney.mp3-a35fe85a5df08f09cd4cf965e60dc611.mp3str"
+
+[deps]
+
+source_file="res://src/audio/music/droney.mp3"
+dest_files=["res://.godot/imported/droney.mp3-a35fe85a5df08f09cd4cf965e60dc611.mp3str"]
+
+[params]
+
+loop=false
+loop_offset=0
+bpm=0
+beat_count=0
+bar_beats=4

src/audio/music/tar-winds.mp3.import

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+[remap]
+
+importer="mp3"
+type="AudioStreamMP3"
+uid="uid://dn2e2hqujlia1"
+path="res://.godot/imported/tar-winds.mp3-7ac6ab80e2c96dfbcd5e5c27c1154ff2.mp3str"
+
+[deps]
+
+source_file="res://src/audio/music/tar-winds.mp3"
+dest_files=["res://.godot/imported/tar-winds.mp3-7ac6ab80e2c96dfbcd5e5c27c1154ff2.mp3str"]
+
+[params]
+
+loop=false
+loop_offset=0
+bpm=0
+beat_count=0
+bar_beats=4

src/audio/music/useless immune system.wav.import

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+[remap]
+
+importer="wav"
+type="AudioStreamWAV"
+uid="uid://6002a12ecfo5"
+path="res://.godot/imported/useless immune system.wav-90ff2c5c12784f54b1b15c7a7e4603b8.sample"
+
+[deps]
+
+source_file="res://src/audio/music/useless immune system.wav"
+dest_files=["res://.godot/imported/useless immune system.wav-90ff2c5c12784f54b1b15c7a7e4603b8.sample"]
+
+[params]
+
+force/8_bit=false
+force/mono=false
+force/max_rate=false
+force/max_rate_hz=44100
+edit/trim=false
+edit/normalize=false
+edit/loop_mode=0
+edit/loop_begin=0
+edit/loop_end=-1
+compress/mode=0