diff --git a/libs/audio/include/psemek/audio/sample.hpp b/libs/audio/include/psemek/audio/sample.hpp
index 31cb757d..fa821a3c 100644
--- a/libs/audio/include/psemek/audio/sample.hpp
+++ b/libs/audio/include/psemek/audio/sample.hpp
@@ -19,7 +19,7 @@ namespace psemek::audio
 	}
 
 	// maps [-1, 1] range to samples
-	inline sample convert(float v)
+	inline sample pack(float v)
 	{
 		static auto const min = static_cast<float>(std::numeric_limits<sample>::min());
 		static auto const max = static_cast<float>(std::numeric_limits<sample>::max());
@@ -27,4 +27,13 @@ namespace psemek::audio
 		return clamp(min + (v * 0.5f + 0.5f) * (max - min));
 	}
 
+	// maps samples to [-1, 1] range
+	inline float unpack(sample s)
+	{
+		static auto const min = static_cast<float>(std::numeric_limits<sample>::min());
+		static auto const max = static_cast<float>(std::numeric_limits<sample>::max());
+
+		return 2.f * (s - min) / (max - min) - 1.f;
+	}
+
 }