...yes i said it was a noob question .....how do you mute the strings when you play a sweep and your going up the strings?
It is not a noob question some advanced guitarists can't sweep cleanly, they even have trouble doing it on the fretboard.
The above replies are all correct.
You have to learn extremely slowly to start then increase the tempo on your metronome gradually.
As you lift your finger from the sixth string mute it with the heel of your palm, then when you lift it from the fifth string roll your palm or slide it down ever so slightly to mute the fifth string and do the same with the fourth string, etc.
Don't forget to roll back/lift your palm as you fret the strings on the way back.
You will move/roll your right hand palm in sync with the left hand fingers you are lifting. The right hand is just important as your left hand when it comes to clean playing.
For other than sweeping I sometimes also mute with the left hand thumb and/or fingers to deaden the strings not played.
It may take you a long time to learn but it is worth it if you end up doing it properly.
Remember to start slow, if you are not playing it right at slow speed slow it down even more until you can. Then and only then increase your speed. If you can't play it properly slow, you definitely won't be able to play it properly fast.
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