enum mode_t {
    ON_DEMAND      = 0,  ///< Instrument will be loaded when needed, freed once not needed anymore.
    ON_DEMAND_HOLD = 1,  ///< Instrument will be loaded when needed and kept even if not needed anymore.
    PERSISTENT     = 2,  ///< Instrument will immediately be loaded and kept all the time.
    #if !WIN32
    VOID           = 127, ///< @deprecated use DONTCARE instead!
    #endif
    DONTCARE       = 127 ///< Don't care, let it up to the InstrumentManager to decide for an appropriate LoadMode.
};