diff --git a/Machines/Amiga/Audio.cpp b/Machines/Amiga/Audio.cpp
index 1fc59995c..ee5b49eda 100644
--- a/Machines/Amiga/Audio.cpp
+++ b/Machines/Amiga/Audio.cpp
@@ -467,6 +467,8 @@ template <> bool Audio::Channel::transit<
 
 	// TODO: include napnav in tests
 
+	period_counter = period;	// i.e. percntrld
+
 	if(!dma_enabled) {
 		return true;
 	} else {
diff --git a/Machines/Amiga/Audio.hpp b/Machines/Amiga/Audio.hpp
index 06db57965..e328d8e7a 100644
--- a/Machines/Amiga/Audio.hpp
+++ b/Machines/Amiga/Audio.hpp
@@ -106,7 +106,7 @@ class Audio: public DMADevice<4> {
 
 			// Output state.
 			int8_t output_level = 0;
-			uint8_t output_phase = 0;
+			uint8_t output_phase = 0;	// TODO: this should count down, not up.
 			bool output_enabled = false;
 		} channels_[4];