+ optional<float> peak_dB = peak ();
+ if (old_peak_dB && *old_peak_dB < -0.5 && peak_dB && *peak_dB > -0.5) {
+ error_dialog (this, _("It is not possible to adjust the content's gain for this fader change as it would cause the DCP's audio to clip. The gain has not been changed."));
+ _gain->wrapped()->SetValue (old_value);
+ _gain->view_changed ();
+ }
+