Hi Mark,
With easy edit, try adding the TREMOLO digital effect, see what you reckon. I think we're hearing a tremolo effect in the Soloist as much as we're hearing vibrato. I don't know how to add a delayed tremolo other than in the easy edit maybe Bill does.
It also sounds good if you add some pitch bend to the attack. I went to PITCH and on page 2 I've set ATK to 70 PEAK to -3 and DKY1 to 44 but it still needs more adjusting. I'm tempted to add a little pitch variation over a longer period but don't have time to try it out right now.
Regards,
Mike