avoid sending replicated fader set position messages

2 files changed, 9 insertions, 0 deletions

diff --git a/libs/surfaces/mackie/fader.cc b/libs/surfaces/mackie/fader.cc
index 46e46cf797..5e40538096 100644
--- a/libs/surfaces/mackie/fader.cc
+++ b/libs/surfaces/mackie/fader.cc
@@ -60,6 +60,13 @@ Fader::update_message ()
 	}
 
 	int posi = lrintf (16384.0 * position);
+
+	if (posi == last_update_position) {
+		return MidiByteArray();
+	}
+
+	last_update_position = posi;
+	
 	DEBUG_TRACE (DEBUG::MackieControl, string_compose ("generate fader message for position %1 (%2)\n", position, posi));
 	return MidiByteArray  (3, 0xe0 + id(), posi & 0x7f, posi >> 7);
 }
diff --git a/libs/surfaces/mackie/fader.h b/libs/surfaces/mackie/fader.h
index 8de8a5896c..e83e657e68 100644
--- a/libs/surfaces/mackie/fader.h
+++ b/libs/surfaces/mackie/fader.h
@@ -14,6 +14,7 @@ class Fader : public Control
 	Fader (int id, std::string name, Group & group)
 		: Control (id, name, group)
 		, position (0.0)
+		, last_update_position (-1)
 	{
 	}
 
@@ -26,6 +27,7 @@ class Fader : public Control
 	
   private:
 	float position;
+	int   last_update_position;
 };
 
 }