https://forums.alliedmods.net/showthread.php?t=4356

loadingsound.sma (original source file)
loadingsound.amxx.182 (compiled for AMX Mod X 1.8.2)
loadingsound.amxx.183 (compiled for AMX Mod X 1.8.3)

loadingsound.sma_rfk (custom source file)
loadingsound.amxx.182_rfk (compiled for AMX Mod X 1.8.2)
loadingsound.amxx.183_rfk (compiled for AMX Mod X 1.8.3)

The '_rfk' files are modified by me. Put 'korn.mp3' in '/cstrike/sound/misc/' on your download url/server.

Do not forget to rename the files to their original names!

loadingsound.amxx.182 -> loadingsound.amxx
loadingsound.amxx.183 -> loadingsound.amxx

loadingsound.sma_rfk -> loadingsound.sma
loadingsound.amxx.182_rfk -> loadingsound.amxx
loadingsound.amxx.183_rfk -> loadingsound.amxx

When you want to compile the source file yourself, do it here and select the right AMX Mod X version.

https://amx.icegame.ro/amxx/webcompiler.php