there is this annoying thing with the RAZR HD, the shutter Sound.
You cant turn it off, you cant silence it and stuff.
I googled a little and found out that if you are rooted, it is quiet easy to turn of that annoying noise.
Just Download a root file manager
then go to /system/media/audio/ui
mount your system as read/write
then simply rename the file Camera_click.ogg to camera_click.ogg.bak
Thats it, you will never hear that sound again, unless you rename the file back to camera_click.ogg
so enjoy and have fun with your silenced camera