Do your levers look like these ones on ebay? (auction #150231301703)

If so, what you do is pull the knurled ring out and twist. This will disengage the syncro ratchet and your levers will be in friction mode.

If your levers are the newer style with the curved handles then these are index only.

Or I can meet you at Campione or Bow Cycle and show you how! haha!