Use XMLNode::set_property in ARDOUR::Amp class

diff --git a/libs/ardour/amp.cc b/libs/ardour/amp.cc
index e2788060bcef7eef2a2b050610d35d6fb37341c8..98257ddd7af3aa881ce53255338821ea962cfb3b 100644 (file)
--- a/libs/ardour/amp.cc
+++ b/libs/ardour/amp.cc
@@ -359,7 +359,7 @@ XMLNode&
 Amp::state (bool full_state)
 {
        XMLNode& node (Processor::state (full_state));
-       node.add_property("type", _gain_control->parameter().type() == GainAutomation ? "amp" : "trim");
+       node.set_property("type", _gain_control->parameter().type() == GainAutomation ? "amp" : "trim");
        node.add_child_nocopy (_gain_control->get_state());
 
        return node;