boost::shared_ptr<Region> bounce (InterThreadInfo&);
boost::shared_ptr<Region> bounce_range (
framepos_t start, framepos_t end, InterThreadInfo&, bool enable_processing
boost::shared_ptr<Region> bounce (InterThreadInfo&);
boost::shared_ptr<Region> bounce_range (
framepos_t start, framepos_t end, InterThreadInfo&, bool enable_processing