Go nuts:
http://www.terriblehands.com/pictureocity/ripon/CastleVania IIIAlmost every sound in the game. Uncaptured are the two Fish Man splashes, Sypha's spells, the Twin Dragons' flameburst (probably the same as Sypha's), the liquidy quinkle for the Potion of Invisibility and a handul more. Most of these sounds had been captured in 2002 (with HUGE help from the BGM-silencing TUNEUP Game Genie code). The rest were captured around 2005 or later under different recording circumstances, so there may be some slight variances in noise or volume.
CastleVania SotN (Akumajou Dracula X: Gekka no Yasoukyouku, actually. My slip.)
A few sounds initially collected for a
Konami VS Capcom demo and a few more collected for other sorts of yuks. Game Genie not required; pop open the PlayStation lid and enjoy the soundplay...just close it down before a CD room or boss fight. "many.wav" contains a few uncut minutes of Japanese audio'ventures through upsidedownland, including the Necromancy Laboratory, Reverse Entrance, and Reverce Caverns.
Super CastleVania (IV)
Here are a few sound effects I gathered up for ParoVadius RESET, including the entire sound test recording they
may have been harvested from.
WARNING: Balance is slightly off; I never got around to a rerecording.
May 13, 2012 Update: ZIPs of each folder have been uploaded. For Great Convenient.