Hi, guys. Hope all is well and in good health!

So I’ve recently started Thrill Is Gone by B. B. King Lesson, instructed by Anders Mouridsen (which I tremendously respect and admire, just as with all the amazing instructors here :) ) when he mentions this: “Turn the amp up loud and use the soft attack and you'll be good to go!” in lesson 3/12.

My question is simple: what’s a soft attack? Is it in the pick or the amp? Are there other types of attacks?

Thank you, in advance. :)