Only in libcdaudio-0.99.12/src: cdaudio.h
diff -r -u libcdaudio-0.99.12/src/cdaudio.h.in libcdaudio-0.99.12.hiro/src/cdaudio.h.in
--- libcdaudio-0.99.12/src/cdaudio.h.in	2001-08-18 22:59:18.000000000 +0900
+++ libcdaudio-0.99.12.hiro/src/cdaudio.h.in	2005-02-04 15:57:21.000000000 +0900
@@ -58,7 +58,7 @@
 #define MAX_SLOTS                               100 /* For CD changers */
 
 /* CDDB defaults */
-#define CDDB_PROTOCOL_LEVEL                     3
+#define CDDB_PROTOCOL_LEVEL                     6
 #define CDDBP_DEFAULT_PORT                      888
 #define HTTP_DEFAULT_PORT                       80
 #define CDDB_EMAIL_SUBMIT_ADDRESS               "freedb-submit@freedb.org"