Well, If I read this post the good news is there is only a few people have reported the problem with the gun sounds, the bad thing is I'm one of them.  
I have SP2 and Acceleration hooked up.  For addons prior to the Weapons pack, I've done a hud update on the stock F-18 to a realistic hud, a hud glass update and the refueller update, all from flightsim.com.

Don't know if any of these addons would have any influence on sound?  

Today they sent me a revised .dll that created a log text, which I've included for some of you techies to look over.  Its a bit long and I don't know when the log started and stopped.  

Source 133317776 loop off
Sound created. File name: \csweapon_mg_shot1.wav, duration: 0.434, source id: 133317776, buffer id: 133309272
Source 133317776 loop off
Source 133336808 loop off
Sound segment created. File name: \csweapon_mg_shot1.wav, duration: 0.100, min time: -1.000, max time: 0.100, source id: 133336808, buffer id: 133309360
Source 133336808 loop on
Source 133338160 loop off
Sound created. File name: \csweapon_mg_fire1.wav, duration: 1.451, source id: 133338160, buffer id: 133309432
Source 133338160 loop off
Source 133339512 loop off
Sound segment created. File name: \csweapon_mg_fire1.wav, duration: 0.507, min time: 0.046, max time: 0.553, source id: 133339512, buffer id: 133309504
Source 133339512 loop on
Source 231369600 loop off
Sound created. File name: \VulcanCannon.wav, duration: 2.937, source id: 231369600, buffer id: 133309576
Source 231369600 loop off
Source 231405904 loop off
Sound segment created. File name: \VulcanCannon.wav, duration: 0.792, min time: 0.514, max time: 1.306, source id: 231405904, buffer id: 133309648
Source 231405904 loop on
Source 231609760 loop off
Sound created. File name: \csweapon_rocket1.wav, duration: 1.148, source id: 231609760, buffer id: 133340864
Source 231609760 loop off
Source 231611112 loop off
Sound created. File name: \csweapon_rocket1.wav, duration: 1.148, source id: 231611112, buffer id: 133340864
Source 231611112 loop off
Source 231612464 loop off
Sound created. File name: \csweapon_rocket1.wav, duration: 1.148, source id: 231612464, buffer id: 133340864
Source 231612464 loop off
Source 231613816 loop off
Sound created. File name: \csweapon_rocket1.wav, duration: 1.148, source id: 231613816, buffer id: 133340864
Source 231613816 loop off
Source 231615168 loop off
Sound created. File name: \csweapon_rocket1.wav, duration: 1.148, source id: 231615168, buffer id: 133340864
Source 231615168 loop off
Source 231616520 loop off
Sound created. File name: \csweapon_rocket1.wav, duration: 1.148, source id: 231616520, buffer id: 133340864
Source 231616520 loop off
Source 231617872 loop off
Sound created. File name: \csweapon_rocket1.wav, duration: 1.148, source id: 231617872, buffer id: 133340864
Source 231617872 loop off
Source 231619224 loop off
Sound created. File name: \csweapon_rocket1.wav, duration: 1.148, source id: 231619224, buffer id: 133340864
Source 231619224 loop off
Source 133341080 loop off
Sound created. File name: \csweapon_rocket1.wav, duration: 1.148, source id: 133341080, buffer id: 133340864
Source 133341080 loop off
Source 133342456 loop off
Sound created. File name: \csweapon_rocket1.wav, duration: 1.148, source id: 133342456, buffer id: 133340864
Source 133342456 loop off
Source 133343832 loop off
Sound created. File name: \csweapon_rocket1.wav, duration: 1.148, source id: 133343832, buffer id: 133340864
Source 133343832 loop off
Source 133345208 loop off
Sound created. File name: \csweapon_rocket1.wav, duration: 1.148, source id: 133345208, buffer id: 133340864
Source 133345208 loop off
Source 133346584 loop off
Sound created. File name: \csweapon_rocket1.wav, duration: 1.148, source id: 133346584, buffer id: 133340864
Source 133346584 loop off
Source 133347960 loop off
Sound created. File name: \csweapon_rocket1.wav, duration: 1.148, source id: 133347960, buffer id: 133340864
Source 133347960 loop off
Source 133349336 loop off
Sound created. File name: \csweapon_rocket1.wav, duration: 1.148, source id: 133349336, buffer id: 133340864
Source 133349336 loop off
Source 133350712 loop off
Sound created. File name: \csweapon_rocket1.wav, duration: 1.148, source id: 133350712, buffer id: 133340864
Source 133350712 loop off
Source 133352088 loop off
Sound created. File name: \csweapon_rocket1.wav, duration: 1.148, source id: 133352088, buffer id: 133340864
Source 133352088 loop off
Source 133353464 loop off
Sound created. File name: \csweapon_rocket1.wav, duration: 1.148, source id: 133353464, buffer id: 133340864
Source 133353464 loop off
Source 133354840 loop off
Sound created. File name: \csweapon_rocket1.wav, duration: 1.148, source id: 133354840, buffer id: 133340864
Source 133354840 loop off
Source 133356216 loop off
Sound created. File name: \csweapon_rocket1.wav, duration: 1.148, source id: 133356216, buffer id: 133340864
Source 133356216 loop off
Source 133357600 loop off
Sound created. File name: \csweapon_rocket1.wav, duration: 1.148, source id: 133357600, buffer id: 133340864
Source 133357600 loop off
Source 133358976 loop off
Sound created. File name: \csweapon_rocket1.wav, duration: 1.148, source id: 133358976, buffer id: 133340864
Source 133358976 loop off
Source 133360352 loop off
Sound created. File name: \csweapon_rocket1.wav, duration: 1.148, source id: 133360352, buffer id: 133340864
Source 133360352 loop off
Source 133317776 stop
Source 133336808 stop
Source 133338160 stop
Source 133339512 stop
Source 231369600 stop
Source 231405904 stop
Source 231609760 stop
Source 231611112 stop
Source 231612464 stop
Source 231613816 stop
Source 231615168 stop
Source 231616520 stop
Source 231617872 stop
Source 133343832 stop
Source 231619224 stop
Source 133341080 stop
Source 133342456 stop
Source 133345208 stop
Source 133346584 stop
Source 133347960 stop
Source 133349336 stop
Source 133350712 stop
Source 133352088 stop
Source 133353464 stop
Source 133354840 stop
Source 133356216 stop
Source 133357600 stop
Source 133358976 stop
Source 133360352 stop