That movie looks very similar to Cubase to me, adding anchor points and then adjusting the middle. But one thing is that you can’t use those stretching techniques in the timeline directly, only in the waveform/sample editor, which is a pity! However, I sometimes cut up the notes and stretch the resulting events, and I do that on the timeline (using the time-stretch tool). If I’ve got a live concert to trawl through then I’ve got special shortcut keys to speed it up, one hand on the keyboard, the other on the mouse, and it goes pretty quickly - although it is rather tedious!
I’ll be interested to hear from the OP how the time-stretching sounds because I usually avoid it due to the burbling, stuttering or distortion effects…
Mike.