I think moan lines will not play if sequence moved to different character, but same does not apply to ImageVoice lines. Those will stay in queue and play later, even if original image is long gone.
IMHO, if you have 3 images in sequence covered with same ImageVoice, if you cycle slowly should play 3 times, but if you cycle fast, it should play less often. Or even skip completely, if blocked from playing by another voice line.