  enum ExpParamId {
    ENUMS(MUTE_PARAM,9),
    BYPASS_PARAM,
    EXP_PARAMS_LEN
  };
  enum ExpInputId {
    ENUMS(MUTE_INPUT,9),
    BYPASS_INPUT,
    EXP_INPUTS_LEN
  };
  enum ExpOutputId {
    EXP_OUTPUTS_LEN
  };
  enum ExpLightId {
    ENUMS(MUTE_LIGHT,9),
    LEFT_LIGHT,
    RIGHT_LIGHT,
    BYPASS_LIGHT,
    EXP_LIGHTS_LEN
  };

  std::string label[9]={"A","B","C","D","E","F","G","H","I"};
