The half-step (one-fret) slide is a common trick that will add a little spice to your rhythm parts. Be aware of the following:
1. As you slide a chord, make sure the strings continue to ring. You don’t want the notes of the chord to “die” as you slide.
2. The slide should be in time—just as if you were strumming the chord.
3. You may be tempted to stop your strumming hand as you slide, but keep “floating” those sixteenth notes.
Begin by just sliding the basic E9 shape from one fret below—strum an E9 chord, and slide your left hand up one fret, sounding the E9 without
actually striking the strings. Are all the strings ringing?
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Now add the sixteenth scratch (“float” over the strings with your right hand during the slide).
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Add two more attacks...
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...and now, take one away.
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Here's a part with a slide and the thirteenth added.
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Now try sliding around with these two chords shapes.
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Of course, this slide technique can be used with any chord.
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This lesson comes from:
Funk Guitar: The Essential Guide