I'd wait for Karl's answers on this, but from what I think it might be better not to. You see, BrainEv has been designed in a contiguous manner so that your brain gradually "trains" itself. I don't know if that effect won't be lost if two different systems with different entrainment levels interfere at any given point. Your brain might just go nuts, who knows. But again - don't listen to me, wait for Karl's response.
As for the system itself (QMP) - frankly the sales page looks pretty fishy to me, but I see Dr. Robert Anthony recommends it, and I've been a fan of his for many years, so who knows...