I have been reading some of the posts on here about upgrading to the new Z4 chip and adding the internal wireless and internal power supply. One of the comments that was made was that if you have the internal wireless and power supply, you cannot go back to using a cable. Are you saying that if I upgrade to the internal system I cannot use the external power supply and a MIDI cable? I am interested in upgrading because the more I play the more I find myself going wireless so just flipping on the power switch on the back of the Zen is a more simple process than hooking up the external power box and transmitter along with a 9volt battery and two AA's. If anyone could clear this up, I am just curious because I don't use my wireless all of the time, rehersals, practice and so on, just when I am out playing a show.