diff --git a/src/mame/drivers/norautp.c b/src/mame/drivers/norautp.c
index 7ffec103fac..6f124289a6a 100644
--- a/src/mame/drivers/norautp.c
+++ b/src/mame/drivers/norautp.c
@@ -653,7 +653,9 @@ static WRITE8_DEVICE_HANDLER( soundlamps_w )
 
 	/* the 4 MSB are for discrete sound */
 	discrete_sound_w(discrete, NORAUTP_SND_EN, (data >> 7) & 0x01);
-	discrete_sound_w(discrete, NORAUTP_FREQ_DATA, (data >> 4) & 0x01);
+	discrete_sound_w(discrete, NORAUTP_FREQ_DATA, (data >> 4) & 0x07);
+
+//	popmessage("sound bits 4-5-6-7: %02x, %02x, %02x, %02x", ((data >> 4) & 0x01), ((data >> 5) & 0x01), ((data >> 6) & 0x01), ((data >> 7) & 0x01));
 }
 
 static WRITE8_DEVICE_HANDLER( counterlamps_w )