Hi Chris,
You should have to re-process the R3D file at all. Just click the “Mute” icon next to the color page controls. This will avoid the overhead of reading audio embedded with the R3D.
If you don’t care about audio at all, you can just disable audio from the project settings, and this will disable audio everywhere.
We are looking at this right now, and will see how we can improve it for Epic clips with Audio.
Regards,
Rohit