Create a folder in C: called temp C:\temp
Open command prompt as administrator
Be sure to back up the entire sound folder on gta sa
command 1:
cd C:\Program Files\Rockstar Games\GTA San Andreas

Command 2:
saat_sfx -e audio\SFX\GENRL C:\temp\saat audio\CONFIG\BankLkup.dat
after you edit the sounds, use command 3

Command 3:
saat_sfx -i audio\SFX\GENRL C:\temp\saat\GENRL\sfx_import.ini audio\CONFIG\BanKLKup.dat

the second time you use the tool, you only need to do steps 1 and 3. forget about step 2 because you already made those files in your temp folder.

for first time downloading saat
copy the files
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saat_sfx.exe

saat_stream.exe

MetaData.xml

metadata-full.ini
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to the gta san andreas directory