unified audio manager that limits the number of simultaneous sounds in certain categories

Assets/_Project/Scripts/Audio/AudioCategory.cs

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+// Assets/_Project/Scripts/Audio/AudioCategory.cs
+namespace TD.Audio
+{
+    public enum AudioCategory { TowerFire, EnemyHitDeath, UI, Music }
+}

Assets/_Project/Scripts/Audio/AudioCategory.cs.meta

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+fileFormatVersion: 2
+guid: 2f652b06e3d150798895893892820cc7

Assets/_Project/Scripts/Audio/AudioManager.cs

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+// Assets/_Project/Scripts/Audio/AudioManager.cs
+using System.Collections.Generic;
+using UnityEngine;
+
+namespace TD.Audio
+{
+    public class AudioManager : MonoBehaviour
+    {
+        [System.Serializable]
+        public struct CategoryConfig
+        {
+            public AudioCategory category;
+            public int           maxVoices;
+            [Range(0f, 1f)]
+            public float         volume;
+        }
+
+        public static AudioManager Instance { get; private set; }
+
+        [SerializeField] private CategoryConfig[] categories;
+
+        private Dictionary<AudioCategory, AudioSource[]> pools;
+        private Dictionary<AudioCategory, int>           indices;
+
+        private void Awake()
+        {
+            if (Instance != null)
+            {
+                Destroy(gameObject);
+                return;
+            }
+            Instance = this;
+            InitializePools();
+        }
+
+        private void OnDestroy()
+        {
+            if (Instance == this) Instance = null;
+        }
+
+        private void InitializePools()
+        {
+            pools   = new Dictionary<AudioCategory, AudioSource[]>();
+            indices = new Dictionary<AudioCategory, int>();
+
+            foreach (var config in categories)
+            {
+                var pool = new AudioSource[config.maxVoices];
+                for (int i = 0; i < config.maxVoices; i++)
+                {
+                    var src = gameObject.AddComponent<AudioSource>();
+                    src.playOnAwake = false;
+                    src.volume      = config.volume;
+                    pool[i]         = src;
+                }
+                pools[config.category]   = pool;
+                indices[config.category] = 0;
+            }
+        }
+
+        public void Play(AudioClip clip, AudioCategory category, float pitch = 1f)
+        {
+            if (clip == null) return;
+            if (!pools.TryGetValue(category, out var pool)) return;
+
+            int idx           = indices[category];
+            var src           = pool[idx % pool.Length];
+            src.pitch         = pitch;
+            src.clip          = clip;
+            src.Play();
+            indices[category] = idx + 1;
+        }
+    }
+}

Assets/_Project/Scripts/Audio/AudioManager.cs.meta

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+fileFormatVersion: 2
+guid: 9ec21c01769ef58d1ac26ba89668eeaa