diff --git a/radio/tests/interpolation/farrow/test.cpp b/radio/tests/interpolation/farrow/test.cpp
index 85d8eae..60de618 100644
--- a/radio/tests/interpolation/farrow/test.cpp
+++ b/radio/tests/interpolation/farrow/test.cpp
@@ -108,7 +108,7 @@ class TimingGeneratorGardner : public Interpolation::TimingGenerator
 
 	virtual ~TimingGeneratorGardner() = default;
 
-	void process(ComplexScalar const &iq)
+	bool process(ComplexScalar const &iq)
 	{
 		// @2 x symbolrate
 		// Symbol timing recovery
@@ -124,6 +124,9 @@ class TimingGeneratorGardner : public Interpolation::TimingGenerator
 		is_time = not is_time;
 
 		update(m_dOmega);
+
+		// Control producing of samples for decimatiion
+		return not is_time;
 	}
 };
 
@@ -187,6 +190,8 @@ void test()
 		remain -= size;
 		n += size;
 	}
+
+	// Save timing aligned data @1sps
 	wavSave("out.wav", header, iq_out);
 	cout << "End of program" << endl;