How do i do a ghost note?

I've seen a lot of them in some riffs from a song of Immolation.

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|-11\(7)/(13)----11\(7)\(1)----|

The notes in between () are ghost notes, right?

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Yeah, they are notes that are hardly heard and that you don't have to hit.

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and how do i play it?

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Hit it, lightly hit it, or don't hit it at all.

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don't hit it.. what a good way to play notes. that's how i do yngwie's stuff.