Hi! Using different techniques. They're all original.
A lot of stuff is made from audio recordings. Some were processed just a little bit, some highly processed to make a completely different sound effect. Some stuff in other sound packs of mine like for instance OSTs - mostly made with virtual plugins, but some parts of the soundtracks might also have highly processed samples from the previous recordings. I often discover completely different sounds by processing the stuff that I already processed once or twice already.