Marvel vs Capcom 2: Deconstructed
Voices & SFX
These are the voice files from the inferior iOS version of the game in WAV form for all the characters and announcer. (Perfect extracts can also be found on this page, don't worry! We just 'figured out' the iOS version first.) Also, the various sound effects throughout the game, such as jumping sounds or the flying screen whistle. Everything that isn't character specific can be found in the Voice_~Misc.rar file.
The non-arcade versions of the game use four unique samples (SE_COMN group 1 tracks 01, 02, 03, and 05) for game mode navigation. The opening screen woosh (SE_COMN group 00 track 30), world swirl (SE_COMN group 01 track 56), and tunnel (SE_COMN group 01 track 68) samples are different between the NAOMI and all other versions. Otherwise all character voice and sound effects are identical between the NAOMI and Dreamcast versions. The Dreamcast and PS3 effects are all identical. The PS2 uses a different audio storage format (SND I believe). The Steam/PS4/Switch Collection uses a slight variant upon the iOS audio files. It is believed that the iOS sounds were based upon the PS2 sounds. The audio reencode they did for iOS is notably inferior to the Dreamcast/NAOMI versions. The rework they did for Steam/PS4/Switch Collection further degrades them: I wrote up a full analysis here.
At the end of the page is a ZIP containing the Dreamcast voice files as DTPK files and extracted out to DSF files. There is also a pointer to the NAOMI versions in WAV form there. (Remember that these are identical to the Dreamcast version other than the woosh/swirl/tunnel sounds.)
On the Dreamcast, the actual voice data are found in the PL_VOI* and SE_* BIN files, which are DTPK archives. You can extract those out with KingShriek's dsfdtpk.py script for Python 2.0, and then play those back with the DSF plugin for FooBar2000. I've included those DTPK and DSF files in this archive. Note that miniDSF files are reliant upon their associated DSFLib file, so remember to keep those files together. (I also wrote DTPKDump, a tool for working with DTPK archives, but that does a lot of power user options you don't need for simple extraction.)
And finally, in the simplest and best form: the NAOMI hardware files are identical to the Dreamcast ones (other than the 3 specific SFX noted at the top of this page). You can find the full MvC2 NAOMI sound collection here in WAV form.