After an entire weekend of wiring and rewiring R2's electronics, I'm starting to realize that one of the components has a major problem. The vmusic2 sound module seems to be the weak link because instead of playing the R2 sounds, it sounds like an obnoxious noisy engine.
It's frustrating because there are only 17 days until Celebration V and this droid must be fully operational by then. To remove these new electronics and rewire the old back is my last resort. But it's beginning to look like that's going to be my only option unless I can figure out what I did wrong or find out the cause and then find a suitable replacement component.
Normally things like this don't rattle me but when you have a hard deadline it can drive you crazy. I tested the amplifier independently and it works just fine. My guess is the vmusic2 module is the bad guy.