_reference->Bind (wxEVT_CHECKBOX, boost::bind (&AudioPanel::reference_clicked, this));
_show->Bind (wxEVT_BUTTON, boost::bind (&AudioPanel::show_clicked, this));
_gain_calculate_button->Bind (wxEVT_BUTTON, boost::bind (&AudioPanel::gain_calculate_button_clicked, this));
_reference->Bind (wxEVT_CHECKBOX, boost::bind (&AudioPanel::reference_clicked, this));
_show->Bind (wxEVT_BUTTON, boost::bind (&AudioPanel::show_clicked, this));
_gain_calculate_button->Bind (wxEVT_BUTTON, boost::bind (&AudioPanel::gain_calculate_button_clicked, this));