Just an FYI, it is possible you will need this:
So I was listening to some old AAC rips from my Roon ROCK on my system and noticed some really bad static when playing 16/44 AAC titles. I tried the files directly using MConnect and no issue.
I looked around and found the solution on the Roon site. My ROCK is over a year old and the ffmpeg file has not been updated since. I got the file and updated, instructions in this link towards the bottom. I know this says for missing Codecs, but it also is to update the version on your ROCK.