well i think that the sound of vulcan in F4 isnt entirely accurate
you're in a full enclosed and pressurised cockpit, with a helmet-built-in earphone with multiple sounds of comm/betty/RWR/ and so on... with a 25k thrust engine roaring loud
the sound like to me like ure sit in a wing instead the cockpit
no for nothing the real F-16 (and there was a old sound file mod in falcon4 that portrait it, strange that the newer versions pass it) has a beep sound when u squeeze the trigger
in real AVTR footage of israeli gun-kills clearly the main sound heared is a beeeeep! instead the real-but-to-loud GRZZZZZZZZZZZZZZZZZZZing! saw-like sound caracteristic of the gatling-type guns
interesting, in footage of AXALP excesises, the DEFA revolving-guns of mirages (with slower -in aprox- 1/3- RPM that the vulcan) sounds more close to the ZZZZZZing of the vulcan tha the tat-tat-tat-tat sound of the movies and the Pum-space-Pum-space-Pum of slower RMP/MV of olders guns
and if u still dislike the gore-movie-saw-like sound, in the /sound folders there are other sounds of "olds machineguns" and "big cannons", just copy it and rename with the same names of the vulcans sound (i think there is 3 files, start-middle-end sounds of M-61 vulcan in the folder)