diff --git a/src/emu/sound/discrete.h b/src/emu/sound/discrete.h
index dc6d1e0f4d4..475a8dedddb 100644
--- a/src/emu/sound/discrete.h
+++ b/src/emu/sound/discrete.h
@@ -3781,6 +3781,8 @@ enum {
 #error "DISCRETE_MAX_NODE_OUTPUTS != 8"
 #endif
 
+#define NODE_RELATIVE(_x, _y) (NODE(NODE_INDEX(_x) + (_y)))
+
 #define NODE_NC  NODE_00
 #define NODE_SPECIAL  NODE(DISCRETE_MAX_NODES)
 
diff --git a/src/mame/audio/asteroid.c b/src/mame/audio/asteroid.c
index 9192c527777..15701cb15b9 100644
--- a/src/mame/audio/asteroid.c
+++ b/src/mame/audio/asteroid.c
@@ -308,7 +308,7 @@ WRITE8_HANDLER( asteroid_thump_w )
 
 WRITE8_HANDLER( asteroid_sounds_w )
 {
-	discrete_sound_w(machine, ASTEROID_SAUCER_SND_EN + offset, data & 0x80);
+	discrete_sound_w(machine, NODE_RELATIVE(ASTEROID_SAUCER_SND_EN, offset), data & 0x80);
 }
 
 WRITE8_HANDLER( astdelux_sounds_w )
diff --git a/src/mame/audio/canyon.c b/src/mame/audio/canyon.c
index 14087be0d32..1dbb4f4cfb8 100644
--- a/src/mame/audio/canyon.c
+++ b/src/mame/audio/canyon.c
@@ -16,7 +16,7 @@
 
 WRITE8_HANDLER( canyon_motor_w )
 {
-	discrete_sound_w(machine, CANYON_MOTOR1_DATA + (offset & 0x01), data & 0x0f);
+	discrete_sound_w(machine, NODE_RELATIVE(CANYON_MOTOR1_DATA, (offset & 0x01)), data & 0x0f);
 }
 
 
@@ -28,13 +28,13 @@ WRITE8_HANDLER( canyon_explode_w )
 
 WRITE8_HANDLER( canyon_attract_w )
 {
-	discrete_sound_w(machine, CANYON_ATTRACT1_EN + (offset & 0x01), offset & 0x02);
+	discrete_sound_w(machine, NODE_RELATIVE(CANYON_ATTRACT1_EN, (offset & 0x01)), offset & 0x02);
 }
 
 
 WRITE8_HANDLER( canyon_whistle_w )
 {
-	discrete_sound_w(machine, CANYON_WHISTLE1_EN + (offset & 0x01), offset & 0x02);
+	discrete_sound_w(machine, NODE_RELATIVE(CANYON_WHISTLE1_EN, (offset & 0x01)), offset & 0x02);
 }
 
 
diff --git a/src/mame/drivers/skydiver.c b/src/mame/drivers/skydiver.c
index 60116e24e90..3d78a164e7d 100644
--- a/src/mame/drivers/skydiver.c
+++ b/src/mame/drivers/skydiver.c
@@ -170,7 +170,7 @@ static WRITE8_HANDLER( skydiver_sound_enable_w )
 
 static WRITE8_HANDLER( skydiver_whistle_w )
 {
-	discrete_sound_w(machine, SKYDIVER_WHISTLE1_EN + (offset >> 1), offset & 0x01);
+	discrete_sound_w(machine, NODE_RELATIVE(SKYDIVER_WHISTLE1_EN, (offset >> 1)), offset & 0x01);
 }
 
 
diff --git a/src/mame/drivers/tank8.c b/src/mame/drivers/tank8.c
index ba69ffe971a..498a4679f62 100644
--- a/src/mame/drivers/tank8.c
+++ b/src/mame/drivers/tank8.c
@@ -90,7 +90,7 @@ static WRITE8_HANDLER( tank8_attract_w )
 
 static WRITE8_HANDLER( tank8_motor_w )
 {
-	discrete_sound_w(machine, TANK8_MOTOR1_EN+offset, data);
+	discrete_sound_w(machine, NODE_RELATIVE(TANK8_MOTOR1_EN, offset), data);
 }
 
 static ADDRESS_MAP_START( tank8_cpu_map, ADDRESS_SPACE_PROGRAM, 8 )