alright so after watching Operation Red Flag on youtube i thought that Lock on needed some better sounds and i went looking for some, now ive downloaded all i could find on LockOnFiles but im not sure which one is the most recent, the best or if it its any of them at all, so it would be really great if someone could tell me which sound mod i should get. also theres some packs which is a mix of other packs

also is it compatible with unmodded playing online?

I'd be reading the "read me" that these mods typically have included before installing them.. If they did not have one- get rid of it