Welcome to he wild, wonderful world of harp guitar. 
I use anything from the palm to wrist to lower forearm. The side of the thumb can work to dampen a lower string and a rest stroke with the thumb can work to dampen I higher string as well.
I’m still a relative noob to the instrument, but it’s a lot of fun. Enjoy!
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Alvarez: DY61
Huss and Dalton: DS Crossroads, 00-SP
Kenny Hill: Heritage, Performance
Larrivee: CS09 Matt Thomas Limited
Taylor: 314ce, 356e, Baritone 8
Timberline: T60HGc
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