I'm surprised no one tried to improve the sound effects in FFVII, yet. I took a look today, and it appears it's very easy to do.
Here is a youtube video I just uploaded. Quality is bad, but it should be sufficient. I willingly silenced the music so you'd hear the effects more easily. You can hear Tifa's critical attack at around 3:35.
I don't think this punch sound is perfect for Tifa anyway... ...too loud, maybe. The thing is, it's quite hard to find sound effects on the web. I came accross this website though :
http://www.freesound.org . Download is free and there is no copyright enfringement, as far as I know (I read the terms of service). My sfx come out of there. You just need to create an account, and to give them credit if you are to publicly release something.
Here is a little step by step tutorial to replace sound effects :
1- get Ficedula's Cosmo
2- select Tools, then Audio Editor
3- find a sfx you like and want in-game. It must be a .wav file. If it's not, you can always convert it back to .wav with a program like Audacity.
4- go into your Start menu, select Programs, then Accessories, entertainment (?), and click on the recorder (my windows is in French, so I'm not sure how these things are called in English).
5- open your sound into the recorder, and choose File then Properties.
6- Select "Convert Now"
7- in the format, choose "Microsoft ADPCM", and just below : 44100 Khz, 4bits, Mono.
8 - save your sound. You can play it before though, to make sure it can be read after those changes. It looks like very short sounds cannot be read after being changed into an ADPCM with these attributs. You can work around this by editing your file in Audacity and add some silence to increase its length.
9 - apparently, Cosmo doesn't mind if the new sound is larger than the original. Just click on the sound ID you wish to replace, and click on "Replace" (duh...). Now go get the new sound, and TADAH ! It's in-game now
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I'm thinking about replacing most sound-effects with higher quality ones. Wish me luck !
EDIT:And here is Bolt ! ****************************************************************
Download linksFFVII-SFX_0.02a.rarFFVII-SFX_0.02b.rarFFVII-SFX_0.1.rar (too lazy to make a readme file in this one, but this is - for now - the one you want to download)