Dynamic text scroller scrolling help

Hey i made a dynamic text scroller and it is too choppy

on (press, release, keyPress “<Up>”) {
currentScroll = scrollableText.scroll;
if (Number(currentScroll)>1) {
scrollableText.scroll = currentScroll-1;
}
}

thats the code i use for the up and the down button though you gotta chnage somthings,but anyways is there anything i can do to make it scroll smooth like instead of

currentScroll-1

cuz it looks way too choppy and i want it too scroll smoothly

please help me thnx in advanced i greatly appreciaate it!!!