Do any of the Droid 3 roms support USB Host Mode?
I tried steel droid 5.0 and a solana kexec CM10 build and it did not work with either. I also tried a bunch of searching but could not find anything specific to the droid 3. It seems to be working on a number of other devices using stock or custom roms. Here is one example:
Using Android to Drive a USB DAC