Does this pedal have a half-damper feature? (i.e. pressing pedal half way down produces half-sustain like a pedal does on a real piano)

No. It is either full on or off.

The sound doesn't seem to change no matter what I do with this sustain pedal????

The sustain pedal is not designed to change the sound of a played key or note. Its purpose is to sustain the played note for a longer period of time even after the piano key is released by the fingering. The sustained action does produce change harmonic sounds because the sound of a key is then blended with the sound of other keys played. I have the SP20 sustain pedal on my Casio Keyboard and It works very well. I like it because it is heavy and it stays where you place it and you can place it exactly where you want it.

Does this connect through a 1/4" jack?

I am cannot verify the inch measurement but assume it is a 1/4 inch. It is referred to as a "standard plug" which means it is not one of the mini-jacks of today's ipods and mp3 players, but like the old style stereo headphone jack plugs that came on stereo receivers and tape decks before the mini's. Hope this helps.

Will this work with the casio ctk-533?

It's a Casio product, so it should, but I can't say I'm 100 percent certain. I'd call Casio to make sure.

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🎶 Sustain your sound, elevate your performance.

EXTENDED REACH - Generous cable length lets you position your pedal exactly where you want—comfort meets control.
SLEEK DISCREET - Matte black finish blends effortlessly into any studio or stage setup—professional and stylish.
TRUE PIANO EXPERIENCE - Piano-style sustain pedal delivers the authentic touch every serious player craves.
PLUG PLAY SIMPLICITY - Easy 3.5mm jack connection means you’re ready to perform in seconds—no adapters needed.
SEAMLESS COMPATIBILITY - Works flawlessly with all Casio keyboards and digital pianos, ensuring zero hassle.

The Casio SP-20 is a premium piano-style sustain pedal designed for adult musicians using Casio digital pianos and keyboards. Featuring a long 3.5mm cord and a sleek black finish, it offers authentic piano feel and reliable plug-and-play connectivity, making it an essential accessory for professional and aspiring pianists alike.

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Age range (description)	Adult
Item weight	0.85 Kilograms
Model name	SP20
Product dimensions	25D x 7W x 5.2H centimetres
Style	Pedal
Connectivity technology	Plug
Power source	Corded Electric
Headphone jack	3.5mm Jack
Instrument	Digital Piano
Manufacturer	Casio Inc.
UPC	079767344924
Global Trade Identification Number	00079767344924
Item model number	SP20
Voltage	120 Volts
Item Weight	850 g

Casio SP-20 Upgraded Piano-Style Sustain Pedal, Black

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