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-rw-r--r--libs/pbd/pbd/controllable.h3
1 files changed, 3 insertions, 0 deletions
diff --git a/libs/pbd/pbd/controllable.h b/libs/pbd/pbd/controllable.h
index f8d8f82855..9f5ed5251b 100644
--- a/libs/pbd/pbd/controllable.h
+++ b/libs/pbd/pbd/controllable.h
@@ -72,6 +72,9 @@ class Controllable : public PBD::StatefulDestructible {
bool is_gain_like() const { return _flags & GainLike; }
bool is_integral_only() const { return _flags & IntegerOnly; }
+ virtual float lower() const { return 0.0f; }
+ virtual float upper() const { return 1.0f; }
+
Flag flags() const { return _flags; }
void set_flags (Flag f);