Bars 17 to 24 were selected and MultiRiffs generated.
The dragged files have a one bar buffer at the start and end to allow for pickup and tail notes.
It would be good if you had an option for the buffer on the start of the file went right to the start of the song making it easier to align.
Though having just the one bar is good if you are adding more riffs further in on the same track.

Watch
https://www.dropbox.com/s/4dqm8awxjpohn2k/BiabVST-Multiriff.mp4?dl=0

Download
https://www.dropbox.com/s/4dqm8awxjpohn2k/BiabVST-Multiriff.mp4?dl=1