Adrian Myers wrote:
it's possible that the vibrato is controlled by CC1/CC2 or some other controller which is not being copied in your selection.
If that's the case, then editing at the clip level instead of editing at the midi event level will fix the issue. If you're working is session view, copy the clip to the arrangement view, and split the clip up into the parts you want to keep. Then duplicate and combine the clips to get the length you want.
If you want to stay in session view, change the start/end points of the clip, crop the clip, and then duplicate the clip loop to your desired length. This last part assumes you're using Live 9.