NO-OP: re-order code, add comments

libs/surfaces/faderport8/actions.cc

@@ -48,6 +48,11 @@ using namespace ArdourSurface::FP8Types;
 	_ctrls.button (ID).pressed.connect_same_thread (button_connections, boost::bind (&FaderPort8::button_user, this, true, ID)); \
 _ctrls.button (ID).released.connect_same_thread (button_connections, boost::bind (&FaderPort8::button_user, this, false, ID));
 
+
+/* Bind button signals (press, release) to callback methods
+ * (called once after constructing buttons).
+ * Bound actions are handled the the ctrl-surface thread.
+ */
 void
 FaderPort8::setup_actions ()
 {
@@ -101,6 +106,10 @@ FaderPort8::setup_actions ()
 	}
 }
 
+/* ****************************************************************************
+ * Direct control callback Actions
+ */
+
 void
 FaderPort8::button_play ()
 {
@@ -254,28 +263,34 @@ FaderPort8::button_mute_clear ()
 	session->set_controls (cl, 0.0, PBD::Controllable::UseGroup);
 }
 
-void
-FaderPort8::button_arm (bool press)
-{
-	FaderMode fadermode = _ctrls.fader_mode ();
-	if (fadermode == ModeTrack || fadermode == ModePan) {
-		_ctrls.button (FP8Controls::BtnArm).set_active (press);
-		ARMButtonChange (press);
-	}
-}
-
 void
 FaderPort8::button_arm_all ()
 {
 	BasicUI::all_tracks_rec_in ();
 }
 
+/* access generic action */
 void
 FaderPort8::button_action (const std::string& group, const std::string& item)
 {
 	AccessAction (group, item);
 }
 
+/* ****************************************************************************
+ * Mode specific and internal callbacks
+ */
+
+/* handle "ARM" press -- act like shift, change "Select" button mode */
+void
+FaderPort8::button_arm (bool press)
+{
+	FaderMode fadermode = _ctrls.fader_mode ();
+	if (fadermode == ModeTrack || fadermode == ModePan) {
+		_ctrls.button (FP8Controls::BtnArm).set_active (press);
+		ARMButtonChange (press); /* EMIT SIGNAL */
+	}
+}
+
 void
 FaderPort8::button_prev_next (bool next)
 {

libs/surfaces/faderport8/fp8_base.h

@@ -31,7 +31,7 @@ namespace ArdourSurface {
 #define fp8_context() dynamic_cast<BaseUI*>(&_base)
 #define fp8_protocol() dynamic_cast<ControlProtocol*>(&_base)
 
-/** Virtual abstracte base of the FaderPort8 control surface
+/** Virtual abstract base of the FaderPort8 control surface
  *
  * This is passed as handle to all elements (buttons, lights,..)
  * to inteface common functionality for the current instance:

libs/surfaces/faderport8/fp8_controls.cc

@@ -276,6 +276,7 @@ FP8Controls::initialize ()
 
 	FP8ButtonInterface::force_change = false;
 }
+
 void
 FP8Controls::all_lights_off () const
 {

libs/surfaces/faderport8/fp8_strip.cc

@@ -315,32 +315,35 @@ FP8Strip::group_mode () const
 void
 FP8Strip::set_mute (bool on)
 {
-	if (_mute_ctrl) {
+	if (!_mute_ctrl) {
-		if (_mute_ctrl->automation_state() == Touch && !_mute_ctrl->touching ()) {
+		return;
-			_mute_ctrl->start_touch (_mute_ctrl->session().transport_frame());
-		}
-		_mute_ctrl->set_value (on ? 1.0 : 0.0, group_mode ());
 	}
+	if (_mute_ctrl->automation_state() == Touch && !_mute_ctrl->touching ()) {
+		_mute_ctrl->start_touch (_mute_ctrl->session().transport_frame());
+	}
+	_mute_ctrl->set_value (on ? 1.0 : 0.0, group_mode ());
 }
 
 void
 FP8Strip::set_solo (bool on)
 {
-	if (_solo_ctrl) {
+	if (!_solo_ctrl) {
-		if (_solo_ctrl->automation_state() == Touch && !_solo_ctrl->touching ()) {
+		return;
-			_solo_ctrl->start_touch (_solo_ctrl->session().transport_frame());
-		}
-		_solo_ctrl->set_value (on ? 1.0 : 0.0, group_mode ());
 	}
+	if (_solo_ctrl->automation_state() == Touch && !_solo_ctrl->touching ()) {
+		_solo_ctrl->start_touch (_solo_ctrl->session().transport_frame());
+	}
+	_solo_ctrl->set_value (on ? 1.0 : 0.0, group_mode ());
 }
 
 void
 FP8Strip::set_recarm ()
 {
-	if (_rec_ctrl) {
+	if (!_rec_ctrl) {
-		const bool on = !recarm_button ().is_active();
+		return;
-		_rec_ctrl->set_value (on ? 1.0 : 0.0, group_mode ());
 	}
+	const bool on = !recarm_button ().is_active();
+	_rec_ctrl->set_value (on ? 1.0 : 0.0, group_mode ());
 }
 
 void
@@ -431,8 +434,6 @@ FP8Strip::notify_x_select_changed ()
 		select_button ().set_active (_x_select_ctrl->get_value() > 0.);
 		select_button ().set_color (0xffff00ff);
 		select_button ().set_blinking (false);
-	} else {
-		; // leave alone.
 	}
 }
 
@@ -562,7 +563,6 @@ FP8Strip::set_strip_mode (uint8_t strip_mode, bool clear)
 	}
 	_strip_mode = strip_mode;
 	_base.tx_sysex (3, 0x13, _id, (_strip_mode & 0x07) | (clear ? 0x10 : 0));
-	//_base.tx_midi3 (0xb0, 0x38 + _id, _bar_mode);
 }
 
 void