You can do parabolic motion with either qarp or tween, you don't need both.
With tween:
> tween x from X1 to X2 in T seconds, linear ease
tween y from Y1 to Y2 in T/2 seconds, OutSine ease, ping-pong
Oh, I see. So the secret is to create two tweens to use the time variation in each of them. The ping-pong so that it forms the parabola, otherwise it would just form a slanted line.
Thanks, I'll try it!