Documentation - adding/replacing audio, but not changing video

[Richard Turner]

I have a ProRes 4444 file containing audio (8 tracks).  I want to replace the audio without re-encoding the video (or decoding and re-encoding). The new audio is currently stored as individual wav files which are two minutes (on the front) overlength. I think that ffmbc is capable of this, but I am struggling to find a good documentation site to help me learn more about how to do this and use the tool generally.  Can anyone help me with this by pointing me in the right direction?  I'm not the best CLI user but I think putting effort learning this is worthwhile.