  We provide a generic scheme offering real time control of directed particle
transport in superimposed driven lattices. This scheme allows to accelerate,
slow and freeze the transport on demand, by switching one of the lattices
subsequently on and off. The underlying physical mechanism hinges on a
systematic opening and closing of channels between transporting and
non-transporting phase space structures upon switching, and exploits cantori
structures which generate memory effects in the population of these structures.
Our results should allow for real time control of cold thermal atomic ensembles
in optical lattices, but might also be useful as a design principle for
targeted delivery of molecules or colloids in optical devices.
