Ian,
Can you save the drawbar settings as user voices on the 910 and then assign them to an OTS?
Tom 
 I don't have the S910 here, Tom,  but I'm sure it works the same as the Tyros4.
 You don't 
have to save the drawbar settings as a 
User Voice...you can save them
 directly to the One Touch Setting.
 But, if you wish, you can do a footage/attack/effects/ setting on the Drawbars, save it as a 
Organ Flutes User Voice, and then save to OTS.
  Either way works fine.
     Ian