Change folder structure, add solution to the root.

DaggerFramework/Source/Audio/AudioBackend.cs

@@ -0,0 +1,40 @@
+namespace DaggerFramework.Audio
+{
+    public abstract class AudioBackend : IDisposable
+    {
+        public abstract void Initialize();
+        public abstract void Update();
+        public abstract void Shutdown();
+        // BUS
+        public abstract void CreateBus(string busName);
+        public abstract void SetBusVolume(string busName, float volume);
+        public abstract float GetBusVolume(string busName);
+
+        // SOUND
+        public abstract void PlaySound(Sound sound, string bus = "Master", float pitch = 1.0f, float volume = 1.0f);
+        public void PlaySound(Sound sound, string bus = "Master") => PlaySound(sound, bus, default, default);
+        public void PlaySoundVariation(Sound sound, string bus = "Master", float pitchVariation = 0.1f, float volume = 1.0f)
+        {
+            var maxPitch = 1.0f + pitchVariation;
+            var minPitch = 1.0f - pitchVariation;
+
+            var pitch = (float)_random.NextDouble() * (maxPitch - minPitch) + minPitch;
+            PlaySound(sound, bus, pitch, volume);
+        }
+
+        // EFFECTS
+        public abstract void AddBusEffect<T>(T effect, string bus = "Master") where T : AudioEffect;
+
+        public void Dispose()
+        {
+            Shutdown();
+        }
+
+        private LehmerRandom _random = new LehmerRandom();
+    }
+
+    public struct SoundInstance
+    {
+
+    }
+}