OK, as requested by @Grimor I've just written an additional app for live tweaking of the parameters. Usual instructions, so put your Panasonic camera into wifi mode and attach your phone/tablet then press the Connect button in the app. Select a base profile with the Profile button and then tweak away on the sliders. Press the STILL button to, erm, take a still and the REC button will start a video recording. While the video is recording, your tweaks are still live to th