diff --git a/Doc/ROM Applications.pdf b/Doc/ROM Applications.pdf
index 3918e320..1c0ce1db 100644
Binary files a/Doc/ROM Applications.pdf and b/Doc/ROM Applications.pdf differ
diff --git a/Doc/RomWBW Applications.pdf b/Doc/RomWBW Applications.pdf
index 6a85a2ef..3f89a06b 100644
Binary files a/Doc/RomWBW Applications.pdf and b/Doc/RomWBW Applications.pdf differ
diff --git a/Doc/RomWBW Architecture.pdf b/Doc/RomWBW Architecture.pdf
index a42e9920..6acc4709 100644
Binary files a/Doc/RomWBW Architecture.pdf and b/Doc/RomWBW Architecture.pdf differ
diff --git a/Doc/RomWBW Disk Catalog.pdf b/Doc/RomWBW Disk Catalog.pdf
index d066df34..dce97ebf 100644
Binary files a/Doc/RomWBW Disk Catalog.pdf and b/Doc/RomWBW Disk Catalog.pdf differ
diff --git a/Doc/RomWBW Getting Started.pdf b/Doc/RomWBW Getting Started.pdf
index 25190fd9..dde6f9e8 100644
Binary files a/Doc/RomWBW Getting Started.pdf and b/Doc/RomWBW Getting Started.pdf differ
diff --git a/ReadMe.md b/ReadMe.md
index 2463e551..29fd7f58 100644
--- a/ReadMe.md
+++ b/ReadMe.md
@@ -3,7 +3,7 @@
 ## Z80/Z180 System Software
 
 Version 3.1 Pre-release  
-10 Dec 2022
+29 Dec 2022
 
 Wayne Warthen <wwarthen@gmail.com>
 
diff --git a/ReadMe.txt b/ReadMe.txt
index b9cafc21..2a73220a 100644
--- a/ReadMe.txt
+++ b/ReadMe.txt
@@ -1,6 +1,6 @@
 RomWBW Getting Started
 Wayne Warthen (mailto:wwarthen@gmail.com)
-10 Dec 2022
+29 Dec 2022
 
 
 
@@ -17,7 +17,7 @@ RomWBW
 Z80/Z180 System Software
 
 Version 3.1 Pre-release
-10 Dec 2022
+29 Dec 2022
 
 Wayne Warthen wwarthen@gmail.com
 
diff --git a/Source/Apps/VGM/Tunes/More/AGGRESS.VGM b/Source/Apps/VGM/Tunes/More/aggress.vgm
similarity index 100%
rename from Source/Apps/VGM/Tunes/More/AGGRESS.VGM
rename to Source/Apps/VGM/Tunes/More/aggress.vgm
diff --git a/Source/Apps/VGM/Tunes/More/ANNA.VGM b/Source/Apps/VGM/Tunes/More/anna.vgm
similarity index 100%
rename from Source/Apps/VGM/Tunes/More/ANNA.VGM
rename to Source/Apps/VGM/Tunes/More/anna.vgm
diff --git a/Source/Apps/VGM/Tunes/BGM.VGM b/Source/Apps/VGM/Tunes/More/bgm.vgm
similarity index 100%
rename from Source/Apps/VGM/Tunes/BGM.VGM
rename to Source/Apps/VGM/Tunes/More/bgm.vgm
diff --git a/Source/Apps/VGM/Tunes/More/DESCENT.VGM b/Source/Apps/VGM/Tunes/More/descent.vgm
similarity index 100%
rename from Source/Apps/VGM/Tunes/More/DESCENT.VGM
rename to Source/Apps/VGM/Tunes/More/descent.vgm
diff --git a/Source/Apps/VGM/Tunes/More/FIELDMAP.VGM b/Source/Apps/VGM/Tunes/More/fieldmap.vgm
similarity index 100%
rename from Source/Apps/VGM/Tunes/More/FIELDMAP.VGM
rename to Source/Apps/VGM/Tunes/More/fieldmap.vgm
diff --git a/Source/Apps/VGM/Tunes/More/ITSGAMOV.VGM b/Source/Apps/VGM/Tunes/More/itsgamov.vgm
similarity index 100%
rename from Source/Apps/VGM/Tunes/More/ITSGAMOV.VGM
rename to Source/Apps/VGM/Tunes/More/itsgamov.vgm
diff --git a/Source/Apps/VGM/Tunes/More/LEMMIN01.VGM b/Source/Apps/VGM/Tunes/More/lemmin01.vgm
similarity index 100%
rename from Source/Apps/VGM/Tunes/More/LEMMIN01.VGM
rename to Source/Apps/VGM/Tunes/More/lemmin01.vgm
diff --git a/Source/Apps/VGM/Tunes/More/PENGUI03.VGM b/Source/Apps/VGM/Tunes/More/pengui03.vgm
similarity index 100%
rename from Source/Apps/VGM/Tunes/More/PENGUI03.VGM
rename to Source/Apps/VGM/Tunes/More/pengui03.vgm
diff --git a/Source/Apps/VGM/Tunes/More/PITFAL02.VGM b/Source/Apps/VGM/Tunes/More/pitfal02.vgm
similarity index 100%
rename from Source/Apps/VGM/Tunes/More/PITFAL02.VGM
rename to Source/Apps/VGM/Tunes/More/pitfal02.vgm
diff --git a/Source/Apps/VGM/Tunes/More/QIX.VGM b/Source/Apps/VGM/Tunes/More/qix.vgm
similarity index 100%
rename from Source/Apps/VGM/Tunes/More/QIX.VGM
rename to Source/Apps/VGM/Tunes/More/qix.vgm
diff --git a/Source/Apps/VGM/Tunes/More/STARTDEM.VGM b/Source/Apps/VGM/Tunes/More/startdem.vgm
similarity index 100%
rename from Source/Apps/VGM/Tunes/More/STARTDEM.VGM
rename to Source/Apps/VGM/Tunes/More/startdem.vgm
diff --git a/Source/Apps/VGM/Tunes/More/TEDDY.VGM b/Source/Apps/VGM/Tunes/More/teddy.vgm
similarity index 100%
rename from Source/Apps/VGM/Tunes/More/TEDDY.VGM
rename to Source/Apps/VGM/Tunes/More/teddy.vgm
diff --git a/Source/Apps/VGM/Tunes/More/TIGER02.VGM b/Source/Apps/VGM/Tunes/More/tiger02.vgm
similarity index 100%
rename from Source/Apps/VGM/Tunes/More/TIGER02.VGM
rename to Source/Apps/VGM/Tunes/More/tiger02.vgm
diff --git a/Source/Apps/VGM/Tunes/More/BGM.VGM b/Source/Apps/VGM/Tunes/bgm.vgm
similarity index 100%
rename from Source/Apps/VGM/Tunes/More/BGM.VGM
rename to Source/Apps/VGM/Tunes/bgm.vgm
diff --git a/Source/Apps/VGM/Tunes/ENDING.VGM b/Source/Apps/VGM/Tunes/ending.vgm
similarity index 100%
rename from Source/Apps/VGM/Tunes/ENDING.VGM
rename to Source/Apps/VGM/Tunes/ending.vgm
diff --git a/Source/Apps/VGM/Tunes/INCHINA.VGM b/Source/Apps/VGM/Tunes/inchina.vgm
similarity index 100%
rename from Source/Apps/VGM/Tunes/INCHINA.VGM
rename to Source/Apps/VGM/Tunes/inchina.vgm
diff --git a/Source/Apps/VGM/Tunes/SHIRAKAW.VGM b/Source/Apps/VGM/Tunes/shirakaw.vgm
similarity index 100%
rename from Source/Apps/VGM/Tunes/SHIRAKAW.VGM
rename to Source/Apps/VGM/Tunes/shirakaw.vgm
diff --git a/Source/Apps/VGM/Tunes/STARTDEM.VGM b/Source/Apps/VGM/Tunes/startdem.vgm
similarity index 100%
rename from Source/Apps/VGM/Tunes/STARTDEM.VGM
rename to Source/Apps/VGM/Tunes/startdem.vgm
diff --git a/Source/HBIOS/hbios.asm b/Source/HBIOS/hbios.asm
index 68fd47a5..352222df 100644
--- a/Source/HBIOS/hbios.asm
+++ b/Source/HBIOS/hbios.asm
@@ -3725,7 +3725,7 @@ SND_ADDENT:
 ;	WORD	UNIT SPECIFIC DATA (TYPICALLY A DEVICE INSTANCE DATA ADDRESS)
 ;
 SND_FNCNT	.EQU	8		; NUMBER OF SND FUNCS (FOR RANGE CHECK)
-SND_MAX		.EQU	5		; UP TO 4 UNITS
+SND_MAX		.EQU	5		; UP TO 5 UNITS
 SND_SIZ		.EQU	SND_MAX * 4	; EACH ENTRY IS 4 BYTES
 ;
 		.DB	SND_FNCNT	; SND FUNCTION COUNT (FOR RANGE CHECK)
diff --git a/Source/HBIOS/sd.asm b/Source/HBIOS/sd.asm
index ba8ad7f6..b0ca2286 100644
--- a/Source/HBIOS/sd.asm
+++ b/Source/HBIOS/sd.asm
@@ -1721,7 +1721,7 @@ SD_SETUP:
 	OUT	(SD_OPRREG),A
 #ENDIF
 ;
-#IF ((SDMODE == SDMODE_MK4) | (SDMODE == SDMODE_DSD) | (SDMODE == SDMODE_PPI)| (SDMODE == SDMODE_MT))
+#IF ((SDMODE == SDMODE_MK4) | (SDMODE == SDMODE_DSD) | (SDMODE == SDMODE_PPI) | (SDMODE == SDMODE_MT))
 	LD	A,SD_OPRDEF
 	LD	(SD_OPRVAL),A
 	OUT	(SD_OPRREG),A
diff --git a/Source/ver.inc b/Source/ver.inc
index 86131ba0..1b89bf73 100644
--- a/Source/ver.inc
+++ b/Source/ver.inc
@@ -2,4 +2,4 @@
 #DEFINE	RMN	1
 #DEFINE	RUP	1
 #DEFINE	RTP	0
-#DEFINE BIOSVER	"3.1.1-pre.185"
+#DEFINE BIOSVER	"3.1.1-pre.186"
diff --git a/Source/ver.lib b/Source/ver.lib
index 500cb551..c8688a75 100644
--- a/Source/ver.lib
+++ b/Source/ver.lib
@@ -3,5 +3,5 @@ rmn	equ	1
 rup	equ	1
 rtp	equ	0
 biosver	macro
-	db	"3.1.1-pre.185"
+	db	"3.1.1-pre.186"
 	endm