BD Ripper (3D Plus) Convert Blu-ray to MKV - Audio Format

[SpamDog]

DVDFab Blu-ray Ripper v8.0.0.5

When converting a Blu-ray to MKV is it possible to select the audio format?
If so how? I see how you can change it from "audiocopy" or "remux" but how can you select the format you want the audio encoded into? I am coming up with some huge file sizes, and I suspect it is because the audio is not being compressed at all.

[IPopov50]

DVDFab Blu-ray Ripper v8.0.0.5

When converting a Blu-ray to MKV is it possible to select the audio format?
If so how? I see how you can change it from "audiocopy" or "remux" but how can you select the format you want the audio encoded into? I am coming up with some huge file sizes, and I suspect it is because the audio is not being compressed at all.

SpamDog,
most likely, you have large size of compressed file because you retaining HD Audio. Usually, if you check "remove HD Audio" box, it will reduce size of audio stream from 3-5 Gb to 1-2 Gb. To keep a good balance between file size and quality, I would suggest to use "mkv.h264.audiocopy" profile with HD Audio removed, and bitrate set to keep Bits/Pixel ratio close to 0.2 or above.
That's pretty much all you can do without tweaking conversion presets.