Add project files.

FreedomFighter/MusicManager.cs

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+using System;
+using System.IO;
+using Microsoft.Xna.Framework.Audio;
+using Microsoft.Xna.Framework.Media;
+
+namespace FreedomFighter;
+
+/// <summary>
+/// Replacement for TOmegaMusic: a flat list of "songs" where some entries are
+/// streamed music (mp3 via MediaPlayer) and some are sound effects (wav).
+/// Indices mirror OmegaMusic1.Songs in GameU.dfm.
+/// </summary>
+public class MusicManager
+{
+    public class Entry
+    {
+        readonly MusicManager _mgr;
+        public string Name = "";
+        public Song? Song;              // streamed music
+        public SoundEffect? Effect;     // wav sfx
+        public int Volume = 100;        // 0..100, Omega convention
+
+        public Entry(MusicManager mgr) => _mgr = mgr;
+
+        public void Play()
+        {
+            if (Song != null)
+            {
+                MediaPlayer.Volume = Volume / 100f;
+                MediaPlayer.Play(Song);
+                _mgr._current = this;
+            }
+            else if (Effect != null)
+            {
+                Effect.Play(Volume / 100f, 0, 0);
+                Volume = 100;   // one-shot volume, like the original's per-play setting
+            }
+        }
+
+        public void Stop()
+        {
+            if (Song != null && _mgr._current == this)
+            {
+                MediaPlayer.Stop();
+                _mgr._current = null;
+            }
+        }
+
+        /// <summary>Playback position in seconds (original used this in the intro).</summary>
+        public double Position => Song != null && _mgr._current == this
+            ? MediaPlayer.PlayPosition.TotalSeconds : 0;
+    }
+
+    Entry? _current;
+    public Entry[] Songs = [];
+
+    public void Load(string contentDir)
+    {
+        MediaPlayer.IsRepeating = true;   // OmegaMusic1.Loop was called every menu frame
+
+        // Index order mirrors OmegaMusic1.Songs in GameU.dfm.
+        // [1] 'Level test.mp3' is lost — Track06.mp3 substitutes.
+        // [3] gameover was a MIDI (Nazi_Rap.mid); MonoGame has no MIDI playback, so it is silent.
+        (string name, string? file)[] entries =
+        [
+            ("level1", @"music\white light.mp3"),
+            ("level2", @"music\Track06.mp3"),
+            ("level3", @"music\G2 Final.mp3"),
+            ("gameover", null),
+            ("title", @"music\Main Menu 2.mp3"),
+            ("fire1", @"sfx\fire1.wav"),
+            ("reload", @"sfx\reload.wav"),
+            ("thump", @"sfx\thump1.wav"),
+            ("beep", @"sfx\beep.wav"),
+            ("credits", @"music\G8 Final.mp3"),
+            ("hit", @"sfx\hit4.wav"),
+            ("explosion", @"sfx\explode2.wav"),
+            ("level4", @"music\Thunderization.mp3"),
+            ("missile", @"sfx\missile.wav"),
+            ("intro", @"music\Intro.mp3"),
+        ];
+
+        Songs = new Entry[entries.Length];
+        for (int i = 0; i < entries.Length; i++)
+        {
+            var e = new Entry(this) { Name = entries[i].name };
+            var file = entries[i].file;
+            if (file != null)
+            {
+                string path = Path.Combine(contentDir, file);
+                if (File.Exists(path))
+                {
+                    try
+                    {
+                        if (path.EndsWith(".wav", StringComparison.OrdinalIgnoreCase))
+                        {
+                            using var fs = File.OpenRead(path);
+                            e.Effect = SoundEffect.FromStream(fs);
+                        }
+                        else
+                        {
+                            e.Song = Song.FromUri(entries[i].name, new Uri(path, UriKind.Absolute));
+                        }
+                    }
+                    catch (Exception ex)
+                    {
+                        Console.WriteLine($"Audio load failed for {file}: {ex.Message}");
+                    }
+                }
+            }
+            Songs[i] = e;
+        }
+    }
+}