Tweak HU-1205

Hello,
Somewhere on the internet I read that the HU-1205 can be tweaked. You can tweak the navigation system so the destination can be adjusted while driving
and you can tweak the sound settings for, maybe, better sound quality. Unfortunatly they did not mention how you should tweak those settings. Does anyone know how to do this and do you have any experience with it?
Thanx MDN
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