Help with this Guitar solo?

Hi, I'm like 98% done with the burn it to the ground solo by Nickelback

I was just wondering, when Chad comes in with the hammer on and pull-off with the wah, is he pulling off twice or once before hammering on to the next string? And how fast is he doing this? I can't determine this because of the level of distortion.

I've tried watching people play it, but they either are wrong, or I can't tell wether there pullin off twice or how fast,etc.
Please help if you can! Thanx
 
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