diff --git a/src/mame/audio/taito_en.cpp b/src/mame/audio/taito_en.cpp
index 4e518f0fce7..60f4497cd7c 100644
--- a/src/mame/audio/taito_en.cpp
+++ b/src/mame/audio/taito_en.cpp
@@ -7,7 +7,7 @@
     TODO:
 
     * Implement ES5510 ESP
-    * Where does the MB8421 go? Taito F3(and Super Chase) have 2 of them on
+    * Where does the MB8421 go? Taito F3 (and Super Chase) have 2 of them on
       the sound area, Taito JC has one.
 
 ****************************************************************************/
diff --git a/src/mame/drivers/lvcards.cpp b/src/mame/drivers/lvcards.cpp
index 2d855815cdd..e3d7f51cb22 100644
--- a/src/mame/drivers/lvcards.cpp
+++ b/src/mame/drivers/lvcards.cpp
@@ -68,7 +68,6 @@ I/O Ports:
 TODO:
 
 - What do the control ports do? Payout?
-- CPU speed/ YM2149 frequencies
 - Input ports need to be cleaned up
 - NVRAM does not work for lvcards?
 
@@ -451,14 +450,12 @@ GFXDECODE_END
 
 static MACHINE_CONFIG_START( lvcards, lvcards_state )
 	// basic machine hardware
-	MCFG_CPU_ADD("maincpu",Z80, 18432000/6) // 3.072 MHz ?
-
+	MCFG_CPU_ADD("maincpu",Z80, 18432000/4) // unknown frequency, assume same as tehkanwc.cpp
 	MCFG_CPU_PROGRAM_MAP(lvcards_map)
 	MCFG_CPU_IO_MAP(lvcards_io_map)
 	MCFG_CPU_VBLANK_INT_DRIVER("screen", lvcards_state,  irq0_line_hold)
 
 	// video hardware
-
 	MCFG_SCREEN_ADD("screen", RASTER)
 	MCFG_SCREEN_REFRESH_RATE(60)
 	MCFG_SCREEN_VBLANK_TIME(ATTOSECONDS_IN_USEC(2500) /* not accurate */)
@@ -474,7 +471,7 @@ static MACHINE_CONFIG_START( lvcards, lvcards_state )
 	// sound hardware
 	MCFG_SPEAKER_STANDARD_MONO("mono")
 
-	MCFG_SOUND_ADD("aysnd", AY8910, 18432000/12)
+	MCFG_SOUND_ADD("aysnd", AY8910, 18432000/12) // unknown frequency, assume same as tehkanwc.cpp
 	MCFG_AY8910_PORT_A_READ_CB(IOPORT("DSW0"))
 	MCFG_AY8910_PORT_B_READ_CB(IOPORT("DSW1"))
 	MCFG_SOUND_ROUTE(ALL_OUTPUTS, "mono", 0.25)
diff --git a/src/mame/drivers/tehkanwc.cpp b/src/mame/drivers/tehkanwc.cpp
index 0d934c8215e..21e69a3c6a5 100644
--- a/src/mame/drivers/tehkanwc.cpp
+++ b/src/mame/drivers/tehkanwc.cpp
@@ -1,22 +1,9 @@
 // license:BSD-3-Clause
 // copyright-holders:Ernesto Corvi, Roberto Fresca
-/* Notes: DJH 04 Jan 2008
-
-  fixed gridiron079gre (shared access to spriteram was broken)
-
-  The inputs seem to be a hacky mess (although there was reportedly a
-  hardware joystick hack for tehkanwc via plugin logic subboard, is this
-  attempting to simulate it?
-
-  Also there is a hack to reset the sound CPU...
-
-*/
-
 /***************************************************************************
 
 Tehkan World Cup - (c) Tehkan 1985
 
-
 Ernesto Corvi
 ernesto@imagina.com
 
@@ -89,6 +76,17 @@ TO DO :
   - Confirm "Difficulty" Dip Switch in 'teedoff'
 
 ***************************************************************************/
+/* Notes: DJH 04 Jan 2008
+
+  fixed gridiron079gre (shared access to spriteram was broken)
+
+  The inputs seem to be a hacky mess (although there was reportedly a
+  hardware joystick hack for tehkanwc via plugin logic subboard, is this
+  attempting to simulate it?
+
+  Also there is a hack to reset the sound CPU...
+
+*/
 
 #include "emu.h"
 #include "cpu/z80/z80.h"
@@ -665,12 +663,12 @@ static MACHINE_CONFIG_START( tehkanwc, tehkanwc_state )
 	MCFG_GENERIC_LATCH_8_ADD("soundlatch")
 	MCFG_GENERIC_LATCH_8_ADD("soundlatch2")
 
-	MCFG_SOUND_ADD("ay1", AY8910, 1536000)
+	MCFG_SOUND_ADD("ay1", AY8910, 18432000/12)
 	MCFG_AY8910_PORT_A_WRITE_CB(WRITE8(tehkanwc_state, portA_w))
 	MCFG_AY8910_PORT_B_WRITE_CB(WRITE8(tehkanwc_state, portB_w))
 	MCFG_SOUND_ROUTE(ALL_OUTPUTS, "mono", 0.25)
 
-	MCFG_SOUND_ADD("ay2", AY8910, 1536000)
+	MCFG_SOUND_ADD("ay2", AY8910, 18432000/12)
 	MCFG_AY8910_PORT_A_READ_CB(READ8(tehkanwc_state, portA_r))
 	MCFG_AY8910_PORT_B_READ_CB(READ8(tehkanwc_state, portB_r))
 	MCFG_SOUND_ROUTE(ALL_OUTPUTS, "mono", 0.25)