All audio was sampled at 48Khz/24 bit with a reference track bounced back to camera. Audio plays fine on R3D proxies or opening raw files in Red Cine. And latest greatest news is that we’ve been able to replicate the FCP issue on some other systems but not all. Seems like it may be something to do with little vs. big endian encoding BUT only on transcodes completed on the Red Rocket (we’ve also confirmed threads discussing the exact same issue over on Red forums).
I am waiting on the DIT to send over a little endian sample of the footage to test it.