I would like to power my project (wifistix + connex + roboaudiostix) with an 11.1v LiPo pack. Having to power the wifi and roboaudio boards separately has led to some confusion. Do I need an external voltage regulator for each board, i.e. one that steps down to 4v for the wifistix, and another that steps down to 5v for the roboaudiostix? What's the best way to proceed?

Someone else has to have done this before.