RealTrack-3527 from set 344 is a 3 part harmony of vocal ohhs with a tempo of 75 BPM and swing 16 feel. The description describes a smooth vibrato in each vocal part. A simpler arrangement or direct input variation is not available.

Since what you're hearing is a composite of three tracks I would first try the 2 part composite track, RT-3528, to see if that is any better. Then I would try each of the individual tracks, RT-3529 to RT-3538 to see if any of them will work for you.

Since the vibrato is in the track description it is likely an effect the vocalist was directed to use so the question becomes did she apply vibrato equally to all tracks or is there some variation.

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