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How the FRICK does this guy slide his harmonics

Why's that? u gotta press down not all the way but far enough that frets would be pressed?
It would take someone more qualified than I in the technicalities of why it works, but think of it this way:

Think of guitar players who use the side of their picking hand thumb against the string to isolate the harmonic (which Jaco Pastorius used in the intro to 'Byrdland'), but you're actually doing it with the fretting hand. It slides as there's no frets to cancel it out.
 
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It would take someone more qualified than I in the technicalities of why it works, but think of it this way:

Think of guitar players who use the side of their picking hand thumb against the string to isolate the harmonic (which Jaco Pastorius used in the intro to 'Byrdland'), but you're actually doing it with the fretting hand. It slides as there's no frets to cancel it out.
So like pinch harmonics?
 
You can slide those harmonics anywhere on a fretless up and down.

Let’s nerd out for a sec.
See the intersection? Those represent some harmonics that occur in anything. But for fun, consider the second from the top as your 12th fret.

Here’s the trick…
That point isn’t just a fret, it’s a division. So if you tap it and move your finger on the board you’re moving that division.
On a fretted you’re skipping from point to point so it isn’t as sustainable.
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Play a harmonic and then lightly press the string to the fingerboard in the same spot and begin to slide.

Alternatively, you can play a harmonic and then slide up from the nut. Both techniques work but the first is more intuitive. The second will allow you to slide the harmonic up past where the fingerboard ends.
 
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Why's that? u gotta press down not all the way but far enough that frets would be pressed?
You slide a harmonics on a fretless by playing the harmonic, and while it's ringing, press the string to the fingerboard and then slide it. You have to press down exactly where the harmonic playing position is before you slide it. As you slide your finger your continuously changing the string length and moving the harmonic.

It doesn't really work on fretted basses because as you slide your finger, it jumps to the next fret and isn't a continuous string-length-change.

You can kinda sorta get it to work sometimes for a bit on fretted basses. But the physics involved just don't work.
 
You slide a harmonics on a fretless by playing the harmonic, and while it's ringing, press the string to the fingerboard and then slide it. You have to press down exactly where the harmonic playing position is before you slide it. As you slide your finger your continuously changing the string length and moving the harmonic.

It doesn't really work on fretted basses because as you slide your finger, it jumps to the next fret and isn't a continuous string-length-change.

You can kinda sorta get it to work sometimes for a bit on fretted basses. But the physics involved just don't work.
Right. As stated before, if I have a fretted bass with really crystal clear harmonics I can sometimes move the harmonic a whole step. The fret then changes the fundamental.