As of now, we have a Rubberband Pitch Scale that effectively changes the scale of the sound, with the following panel (as of KdenLive 21.12.3)

and basically, I can't use that pitch effect on a sound where I want it to slide down or up over time. I don't want to slice the audio track while making it go and have a different pitch every half a second or lower.

Is it possible in the future on new release versions? It does not need to be accompanied by an AV speed controller but its another idea to think about just in case it is needed.

You can try the Time Remapping feature. https://docs.kdenlive.org/en/effects_an ... peed-ramps