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a/libupnpp/control/renderingcontrol.hxx b/libupnpp/control/renderingcontrol.hxx
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    int getVolume(const std::string& channel = "Master");
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    int getVolume(const std::string& channel = "Master");
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    int setMute(bool mute, const std::string& channel = "Master");
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    int setMute(bool mute, const std::string& channel = "Master");
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    bool getMute(const std::string& channel = "Master");
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    bool getMute(const std::string& channel = "Master");
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protected:
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protected:
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    /* My service type string */
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    static const std::string SType;
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    static const std::string SType;
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private:
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private:
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    void evtCallback(const std::unordered_map<std::string, std::string>&);
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    void evtCallback(const std::unordered_map<std::string, std::string>&);
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    void registerCallback();
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    void registerCallback();