3 files changed, 6 insertions, 2 deletions
diff --git a/libs/ardour/ardour/amp.h b/libs/ardour/ardour/amp.h
index b70cd0095c..5408c86bff 100644
--- a/libs/ardour/ardour/amp.h
+++ b/libs/ardour/ardour/amp.h
@@ -106,8 +106,6 @@ public:
 
 	std::string value_as_string (boost::shared_ptr<AutomationControl>) const;
 
-        static const float max_gain_coefficient;
-
 private:
 	bool   _denormal_protection;
 	bool   _apply_gain;
diff --git a/libs/ardour/ardour/dB.h b/libs/ardour/ardour/dB.h
index 4d5f6c9f44..abacdfcd29 100644
--- a/libs/ardour/ardour/dB.h
+++ b/libs/ardour/ardour/dB.h
@@ -34,6 +34,11 @@ static inline float accurate_coefficient_to_dB (float coeff) {
 	return 20.0f * log10f (coeff);
 }
 
+static inline double dB_coeff_step(double max_coeff) {
+	const double max_db = lrint(accurate_coefficient_to_dB(max_coeff));
+	return 0.1 * (max_coeff / max_db);
+}
+
 extern double zero_db_as_fraction;
 
 #endif /* __ardour_dB_h__ */
diff --git a/libs/ardour/ardour/parameter_descriptor.h b/libs/ardour/ardour/parameter_descriptor.h
index 3e042e1e48..749ed10973 100644
--- a/libs/ardour/ardour/parameter_descriptor.h
+++ b/libs/ardour/ardour/parameter_descriptor.h
@@ -54,6 +54,7 @@ struct LIBARDOUR_API ParameterDescriptor : public Evoral::ParameterDescriptor
 	boost::shared_ptr<ScalePoints> scale_points;
 	uint32_t                       key;  ///< for properties
 	Variant::Type                  datatype;  ///< for properties
+	AutomationType                 type;
 	Unit                           unit;
 	float                          step;
 	float                          smallstep;