How do I check a value is changing ?

In my game, I made a custom slider with a sprite vertical bar and a sprite slider.

SLider moves on the bar through constraint drag behavior with a step of 10 pixels, meaning the dragging is not fluid. I'd like to play a ticking noise when the slider moves step by step. How can I do that ?

I thought of having a listener listening for the slider Y coordinate to change and then play the sound.

I tried many different approaches but no success.

How can I do that ?

Since it’s vertical you could give the slider called oldy and do an event like:

System: pick by comparison: sprite: abs(sprite.y-sprite.oldy)>=10
— play sound
— sprite: set oldy to self.y

Sprite: y>=self.oldy+10
Or
Sprite: y<=self.oldy-10
— play sound
— sprite: set oldy to self.y

Variable count=0

For each sprite
— set count to int(abs(sprite.y-sprite.oldy)/sprite.step times)
— sprite: oldy to self.y
— repeat count times
— audio: schedule play tick sound at self.currentTime+loopindex*dt/count

Thanks rojohound !

do you mean I should give the slider a variable called oldY ? (is the word "variable" missing in your first sentence ?)

Yeah I meant to write variable there