diff --git a/src/mame/drivers/bbusters.c b/src/mame/drivers/bbusters.c
index 343a9ae62f0..ca95b001eb8 100644
--- a/src/mame/drivers/bbusters.c
+++ b/src/mame/drivers/bbusters.c
@@ -674,7 +674,7 @@ static void sound_irq( int irq )
 static const struct YM2608interface ym2608_interface =
 {
 	{
-		AY8910_LEGACY_OUTPUT,
+		AY8910_LEGACY_OUTPUT | AY8910_SINGLE_OUTPUT,
 		AY8910_DEFAULT_LOADS,
 		NULL, NULL, NULL, NULL
 	},
diff --git a/src/mame/drivers/pipedrm.c b/src/mame/drivers/pipedrm.c
index 5c4eb295db4..04a61637427 100644
--- a/src/mame/drivers/pipedrm.c
+++ b/src/mame/drivers/pipedrm.c
@@ -534,7 +534,7 @@ static void irqhandler(int irq)
 static const struct YM2608interface ym2608_interface =
 {
 	{
-		AY8910_LEGACY_OUTPUT,
+		AY8910_LEGACY_OUTPUT | AY8910_SINGLE_OUTPUT,
 		AY8910_DEFAULT_LOADS,
 		NULL, NULL, NULL, NULL
 	},
diff --git a/src/mame/drivers/tail2nos.c b/src/mame/drivers/tail2nos.c
index 0d5a67c9a21..0277d2c95ae 100644
--- a/src/mame/drivers/tail2nos.c
+++ b/src/mame/drivers/tail2nos.c
@@ -225,7 +225,7 @@ static void irqhandler(int irq)
 static const struct YM2608interface ym2608_interface =
 {
 	{
-		AY8910_LEGACY_OUTPUT,
+		AY8910_LEGACY_OUTPUT | AY8910_SINGLE_OUTPUT,
 		AY8910_DEFAULT_LOADS,
 		NULL,
 		NULL,
diff --git a/src/mame/drivers/wc90.c b/src/mame/drivers/wc90.c
index b3c639e75c0..5897ba313e0 100644
--- a/src/mame/drivers/wc90.c
+++ b/src/mame/drivers/wc90.c
@@ -310,7 +310,7 @@ static void irqhandler(int irq)
 static const struct YM2608interface ym2608_interface =
 {
 	{
-		AY8910_LEGACY_OUTPUT,
+		AY8910_LEGACY_OUTPUT | AY8910_SINGLE_OUTPUT,
 		AY8910_DEFAULT_LOADS,
 		NULL, NULL, NULL, NULL
 	},