+ boost::shared_ptr<AutomationList> gl (new AutomationList (Evoral::Parameter (GainAutomation)));
+ _gain_control = boost::shared_ptr<GainControl> (new GainControl (_session, Evoral::Parameter(GainAutomation), gl));
+ add_control (_gain_control);
+
+ _amp.reset (new Amp (_session, _("Fader"), _gain_control, true));