diff --git a/src/mame/drivers/astrocde.c b/src/mame/drivers/astrocde.c
index b76f406ea3a..04b464a6e41 100644
--- a/src/mame/drivers/astrocde.c
+++ b/src/mame/drivers/astrocde.c
@@ -1419,7 +1419,7 @@ static MACHINE_DRIVER_START( gorf )
 
 	MDRV_SOUND_ADD(SAMPLES, 0)
 	MDRV_SOUND_CONFIG(gorf_samples_interface)
-	MDRV_SOUND_ROUTE(ALL_OUTPUTS, "upper", 0.25)
+	MDRV_SOUND_ROUTE(ALL_OUTPUTS, "upper", 0.85)
 MACHINE_DRIVER_END