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GTA SA: Better gun sounds - No rain bug v7.1 by Triangulum
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Bank 137 = Weapon sounds / combat related audio
Bank 46 = Fire / explosions
Bank 21,22,23,24,25 = Supersonic bullet crack sounds (Bank 21 contains other various sounds)

The two alternate versions (cut / cut+LQ) may fix several other bugs, such as issues with car sirens/horns.

Version 7.1 utilizes Ryosuke's "Weapon Limit Adjuster" mod to allow for custom configuration of gun sound IDs and pitch adjustment for individual weapons (so you must use the files in the "Copy to main GTA San Andreas folder" to get the full effect of the mod).

You must replace all of the other sounds in bank_137 (NOT JUST THE GUN SOUNDS!). This is because I cut the duration of most of the other original sounds (such as skydiving, punching, etc) to allow for slightly longer durations for gun sounds (see next section for details). 

Refer to this video for a tutorial on how to replace the weapon sounds manually: http://www.youtube.com/watch?v=WiJiDPUpr98

Refer to this web page to see the list of sounds that correspond to weapons (bank_137 of GENRL): http://pdescobar.home.comcast.net/~pdescobar/gta/saat/sfx_dir.html

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What is the "rain bug" and how does this fix it?
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The rain will begin to sample bits of other audio (katana slashing, flamethrower sounds, clanging, etc) in place of the original rain sound if gun sounds go beyond a certain quality limit. This is a video showing what happens: http://www.youtube.com/watch?feature=player_detailpage&v=dfAKYOmcBGM#t=100s 

Fixing the rain bug requires lowering the frequency and cutting the audio of high quality sounds to match the original files as closely as possible. Most original audio files have a 22050Hz sample rate and around 0.15-0.2 seconds duration. The original four "far shot"/reverberation sounds are each around 1 second long, so I took advantage of them by using new sounds and amplifying them (originals are very quiet), making the overall duration seem much longer except when in interiors. 

The main problem with many other weapon sound packs is that the duration limit is far exceeded by weapon sounds that are often 5-10x longer than the originals (around 1 or 2 seconds) because they use the reverberation sound within the same audio file as the weapon firing sound, while ignoring the actual reverberation sounds.

However, this duration "limit" can be increased by slightly shortening some of the other original sounds in bank 137 (skydiving, punching, etc) to compensate for having longer/higher quality gun sounds. This allows for the duration for many weapons to be extended from 0.15-0.2 secs to 0.4-0.5 secs, as well as being able to raise the sample rate from 22050 to 29000Hz for most sounds (for increased sound quality).