sequenceDiagram
    participant User
    participant Panel
    participant RecorderManager
    participant Audio Engine

    rect rgb(200, 230, 255)
        Note over User, RecorderManager: Initialization Phase
        User ->> Panel: 1. Request recording feature
        Panel ->> RecorderManager: 2. getRecorderManager()
        RecorderManager -->> Panel: 3. Return global manager instance
    end

    rect rgb(200, 255, 225)
        Note over User, Audio Engine: Recording Control Phase
        User ->> RecorderManager: 4. start()
        RecorderManager ->> Audio Engine: 5. Activate recording device
        Note right of Audio Engine: Enable AGC (Automatic Gain Control), Enable VAD (Voice Activity Detection)

        par Real-Time Processing
            Audio Engine ->> Audio Engine: 6. AGC dynamically adjusts volume
            Audio Engine ->> Audio Engine: 7. VAD detects speech segments
            Audio Engine ->> RecorderManager: 8. Real-time callback of volume data
            RecorderManager ->> Panel: 9. Update UI waveform chart
        end

        alt User pauses
            User ->> RecorderManager: 10. pause()
            RecorderManager ->> Audio Engine: 11. Pause input stream
            Audio Engine -->> RecorderManager: 12. Confirm pause
        else User resumes
            User ->> RecorderManager: 13. resume()
            RecorderManager ->> Audio Engine: 14. Resume input stream
            Audio Engine -->> RecorderManager: 15. Confirm resume
        end
    end

    rect rgb(255, 225, 200)
        Note over User, RecorderManager: End Recording Phase
        User ->> RecorderManager: 16. stop()
        RecorderManager ->> Audio Engine: 17. Stop recording
        Audio Engine ->> Audio Engine: 18. Generate final audio file
        Note right of Audio Engine: Supported formats: MP3, G.711A, G.711U, nOpus, AAC, mSBC
        Audio Engine -->> RecorderManager: 19. Return file path
        RecorderManager ->> User: 20. Display recording complete
    end