A real trick to slide but one you already use most of the time when chording or lead work is muting unused strings. So depending on what finger you put the slide on the other fingers can be used to mute. So try different fingers for the slide and for muting until you find a set up that is comfortable to you. I use a slide on my middle finger so I can mute lower strings on the kneck High E and B with my pinky front of slide and use my index finger to mute the upper top of kneck low E and A back of slide. And then some times you want all the strings too ring. Hope this helps
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