Index: src/mame/drivers/liberatr.c
===================================================================
--- src/mame/drivers/liberatr.c	(.../mame0116u2)	(revision 1537)
+++ src/mame/drivers/liberatr.c	(.../mame0116u3)	(revision 1537)
@@ -400,11 +400,11 @@
 	/* sound hardware */
 	MDRV_SPEAKER_STANDARD_MONO("mono")
 
-	MDRV_SOUND_ADD(POKEY, FREQ_17_APPROX)
+	MDRV_SOUND_ADD(POKEY, 1250000)
 	MDRV_SOUND_CONFIG(pokey_interface_1)
 	MDRV_SOUND_ROUTE(ALL_OUTPUTS, "mono", 0.50)
 
-	MDRV_SOUND_ADD(POKEY, FREQ_17_APPROX)
+	MDRV_SOUND_ADD(POKEY, 1250000)
 	MDRV_SOUND_CONFIG(pokey_interface_2)
 	MDRV_SOUND_ROUTE(ALL_OUTPUTS, "mono", 0.50)
 MACHINE_DRIVER_END