diff --git a/libs/evoral/src/Curve.cpp b/libs/evoral/src/Curve.cpp
index dae23dc591..bf08f509f3 100644
--- a/libs/evoral/src/Curve.cpp
+++ b/libs/evoral/src/Curve.cpp
@@ -195,6 +195,8 @@ Curve::_get_vector (double x0, double x1, float *vec, int32_t veclen)
 	int32_t original_veclen;
 	int32_t npoints;
 
+	cerr << "Check1: veclen = " << veclen << endl;
+
 	if ((npoints = _list.events().size()) == 0) {
 		for (i = 0; i < veclen; ++i) {
 			vec[i] = _list.default_value();
@@ -202,6 +204,8 @@ Curve::_get_vector (double x0, double x1, float *vec, int32_t veclen)
 		return;
 	}
 
+	cerr << "Check2: veclen = " << veclen << endl;
+
 	/* events is now known not to be empty */
 
 	max_x = _list.events().back()->when;
@@ -217,6 +221,8 @@ Curve::_get_vector (double x0, double x1, float *vec, int32_t veclen)
 
 	original_veclen = veclen;
 
+	cerr << "Check3: veclen = " << veclen << endl;
+
 	if (x0 < min_x) {
 
 		/* fill some beginning section of the array with the
@@ -236,6 +242,8 @@ Curve::_get_vector (double x0, double x1, float *vec, int32_t veclen)
 		vec += subveclen;
 	}
 
+	cerr << "Check4: veclen = " << veclen << endl;
+
 	if (veclen && x1 > max_x) {
 
 		/* fill some end section of the array with the default or final value */
@@ -259,6 +267,8 @@ Curve::_get_vector (double x0, double x1, float *vec, int32_t veclen)
 		veclen -= subveclen;
 	}
 
+	cerr << "Check5: veclen = " << veclen << endl;
+
 	if (veclen == 0) {
 		return;
 	}
@@ -271,6 +281,7 @@ Curve::_get_vector (double x0, double x1, float *vec, int32_t veclen)
 		return;
 	}
 
+	cerr << "Check6: veclen = " << veclen << endl;
 
 	if (npoints == 2) {
 
@@ -307,10 +318,14 @@ Curve::_get_vector (double x0, double x1, float *vec, int32_t veclen)
 		return;
 	}
 
+	cerr << "Check7: veclen = " << veclen << endl;
+	
 	if (_dirty) {
 		solve ();
 	}
 
+	cerr << "Check8: veclen = " << veclen << endl;
+
 	rx = lx;
 
 	double dx = 0;
@@ -318,6 +333,8 @@ Curve::_get_vector (double x0, double x1, float *vec, int32_t veclen)
 		dx = (hx - lx) / (veclen - 1);
 	}
 
+	cerr << "Check9: veclen = " << veclen << endl;
+
 	for (i = 0; i < veclen; ++i, rx += dx) {
 		vec[i] = multipoint_eval (rx);
 	}