The 7cap has all the features of the 9cap,except it only holds 10 planes,and it takes crystals instead of the modules,also i dont think the synthesizer will work on the 7cap.Elevator mixing should not be a problem.For 149$ for just the radio you cant beat the price,and im also tapped out from x-mass,ive never had more then three planes flying at the same time anyway,so this should be fine for me,if i can get a good one.