Read Spectrum Samples From Clip Store

Util/Audio/OfflineAudioMixer.cs

@@ -107,6 +107,9 @@ internal sealed class OfflineAudioMixer : IDisposable
         _store.Start();
     }
 
+    /// <summary>Clip store of this render (output rate = mixer sample rate), also read by <see cref="AudioSpectrumGenerator"/>.</summary>
+    internal AudioClipStore Store => _store;
+
     // ── Main thread ──
 
     /// <summary>Registers the song clip. The song voice is created and kept in sync by <see cref="UpdateBGM"/>.</summary>