I have a Galaxy nexus (LTE) here, a Rezound, and 2 pairs of the same Dre iBeats. Using Play Music on the Nexus, Using HTC Player on the Rezound, same song, hitting play at the same time, 1 earbud from each phone in each ear... I can say that it definitely is not working on the Galaxy Nexus.
Not here to bash... Just posting my results. You have no idea how bad I really want beats on my Nexus. Makes me so jealous of my GF's Rezound. We're always using her phone in the car because it really does sound amazing
I applaud your efforts though! Thank you anyways.
Edit: I'm going to disable MusicFX.apk on the Nexus, clear dalvik/cache, reboot and see what happens. I'll be back shortly..
Beesley on IRC
Follow me on Twitter - TheRealBeesley