I purchased the Asus dock for the Nexus 7 tablet. $30 plus shipping from the Google Play Store.
I demonstrate that OTG works, audio output, and volume control works, even with CyanogenMod builds.
Overall, it's a fun accessory, but it seems to be a bit overpriced in my opinion.
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::UPDATE::
Goo servers are back up, so links should be working again!
This is my FINAL VERSION of my Idiots Guide for the HP Touchpad. Now that a stable enough version of CM10 is available, I finally created a guide for you.
Here are links to the files you will need:
ClockWork Recovery (You only need this if you don't already have CWM or TWRP)
If you need the Novacom Drivers, get the correct version from my LINKS page.
I purchased a dbrand vinyl skin to cover up the silly looking back of the Nexus 4. I purchased the black leather one found here:
http://dbrand.com/submodels/nexus-4/
This thing is top quality. It was easy to install and looks amazing.
I wanted to make sure that it works well with the official Nexus 4 bumper... and it does!
I plan on doing a full series of videos for the Nexus 4, so be sure to stay tuned!