[quote name='Roland Rock' timestamp='1334159975' post='1611830']
I don't get this, unless you're left-handed. How can you do that if you're fretting the notes at the same time?
There is playing ghost notes, but that's not the subject of the thread AFAICS.
Palm muting is an option, using the plucking hand.
[/quote]
How many fingers do you use to fret ?
Use the ones you're not using to mute the strings. If I'm slapping octaves then I use fingers 1 and 4 to fret, and my 2nd finger I use as a mute.