Scott's example recommended 6 players at net and one across net at baseline. For safety reasons I think this might be a few to many but I will try it out soon and let you know. Anyway all players but one are at the net; one is across the net at the baseline. However many players are at the net, the baseline player gets that many balls/chances. So in Scott's example, with six players at net, baseline player gets six balls/chances. Coach feeds balls to baseline player one at a time. If net player misses, they sit down. Object of game is for baseline player to get all net players out with however many balls they are allotted.
Scott's example did not say if lobs are allowed. I am guessing not, unless you are working on improving lobs.