diff --git a/src/Sound/voice.cxx b/src/Sound/voice.cxx
index 1c39470..6ab58d1 100644
--- a/src/Sound/voice.cxx
+++ b/src/Sound/voice.cxx
@@ -314,6 +314,8 @@ void FGVoiceMgr::FGVoice::valueChanged(SGPropertyNode *node)
 	const string s = node->getStringValue();
 	//cerr << "\033[31;1mBEFORE [" << s << "]\033[m" << endl;
 
+    SG_LOG(SG_SOUND, SG_INFO, "FGVoice::valueChanged " << s  );
+
 	string m;
 	for (unsigned int i = 0; i < s.size(); i++) {
 		char c = s[i];