Change the tempo during playback without applying any effect

My version of Audacity is 2.4.2.
I would like to modify a specific point in my audio file but I don’t know which exact point on my curve corresponds to the sound in question. For this, I would like to play my audio at a slower tempo without distorting it as it does (lower sound) if I use the “Play-at-speed” slider.
Is it possible ?
Thank you,

PS: if I apply the “Change tempo” effect and modify the precise point I talk about at the very beginning of the message, I don’t know how to cancel this effect without cancelling the last modificaton.

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