Enable 3D sound when only one local player

Assets/Scripts/Audio/AudioGroup.cs

@@ -1,5 +1,7 @@
-using CollectionExtensions;
+using System.Linq;
+using CollectionExtensions;
 using UnityEngine;
+using UnityEngine.SceneManagement;
 
 [CreateAssetMenu(fileName = "AudioGroup", menuName = "Audio/New Audio Group")]
 public class AudioGroup : ScriptableObject
@@ -30,6 +32,13 @@ private void Modulate(AudioSource source)
         var pitch = continuousPitchBend ? Random.Range((float)semitoneRange.Min, (float)semitoneRange.Max) : Random.Range(semitoneRange.Min, semitoneRange.Max);
         source.pitch = Mathf.Pow(SEMITONE_PITCH_CONVERSION_UNIT, pitch);
         source.volume = Random.Range(volumeRange.Min, volumeRange.Max);
+
+        // Use 3D sound if there's only one local player,
+        // otherwise we're in splitscreen and should not spatialize sounds.
+        var isOnlyOneLocalPlayer = PlayerInputManagerController.Singleton.LocalPlayerInputs.Count == 1;
+        // TODO replace this check!
+        var isInArena = Scenes.NotArenaScenes.Contains(SceneManager.GetActiveScene().name);
+        source.spatialBlend = isOnlyOneLocalPlayer && isInArena ? 0 : 1;
     }
 
     public void Play(AudioSource source)