Does anybody know how to play the Fretless part of this song?

It's really cool and i recently converted my guitar to a fretless.

Any help would be appreciated. Thanks.
Schecter Hellraiser C7 FR/Bareknuckle Cold Sweat/Liquifire
Godin A12 - For Sale
1991 EBMM Silhouette
Emperor 2x12

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Like going fast?