3 files changed, 9 insertions, 6 deletions
diff --git a/libs/ardour/ardour/dB.h b/libs/ardour/ardour/dB.h
index 209ab11edc..e5865aabd8 100644
--- a/libs/ardour/ardour/dB.h
+++ b/libs/ardour/ardour/dB.h
@@ -34,4 +34,6 @@ static inline float accurate_coefficient_to_dB (float coeff) {
 	return 20.0f * log10 (coeff);
 }
 
+static const double zero_db_as_fraction = 0.781787;
+
 #endif /* __ardour_dB_h__ */
diff --git a/libs/ardour/ardour/monitor_processor.h b/libs/ardour/ardour/monitor_processor.h
index 023dacb619..5b724b5e8d 100644
--- a/libs/ardour/ardour/monitor_processor.h
+++ b/libs/ardour/ardour/monitor_processor.h
@@ -20,6 +20,7 @@
 #ifndef __ardour_monitor_processor_h__
 #define __ardour_monitor_processor_h__
 
+#include <algorithm>
 #include <iostream>
 #include <vector>
 
@@ -52,7 +53,7 @@ public:
 	void set_value (double v) {
 		T newval = (T) v;
 		if (newval != _value) {
-			_value = newval;
+			_value = std::max (_lower, std::min (_upper, newval));
 			Changed(); /* EMIT SIGNAL */
 		}
 	}
@@ -68,7 +69,7 @@ public:
 
 	MPControl& operator=(const T& v) {
 		if (v != _value) {
-			_value = v;
+			_value = std::max (_lower, std::min (_upper, v));
 			Changed (); /* EMIT SIGNAL */
 		}
 		return *this;
diff --git a/libs/ardour/ardour/proxy_controllable.h b/libs/ardour/ardour/proxy_controllable.h
index cbbdcbd6ca..169f60f9f5 100644
--- a/libs/ardour/ardour/proxy_controllable.h
+++ b/libs/ardour/ardour/proxy_controllable.h
@@ -33,18 +33,18 @@ namespace ARDOUR {
 class ProxyControllable : public PBD::Controllable {
 public:
 	ProxyControllable (const std::string& name, PBD::Controllable::Flag flags,
-			   boost::function1<void,double> setter,
+			   boost::function1<bool,double> setter,
 			   boost::function0<double> getter)
 		: PBD::Controllable (name, flags)
 		, _setter (setter)
 		, _getter (getter)
 	{}
 
-	void set_value (double v) { _setter (v); }
-	double get_value () const { return _getter (); }
+        void set_value (double v) { if (_setter (v)) { Changed(); /* EMIT SIGNAL */ } }
+        double get_value () const { return _getter (); }
 
 private:
-	boost::function1<void,double> _setter;
+	boost::function1<bool,double> _setter;
 	boost::function0<double> _getter;
 };