Some things to consider when recording with Audacity-
If frugally installed set temporary directory outside of SaveFile . Go to edit > preferences > directories set to something like /mnt/home/audacity-temp
Select view > 'show clipping' highlight any part of the recording that has distorted due to input being too high.
Use Jack to monitor if your system is recording continuously without gaps (due to not enough processor time allocated, or not fast enough processor).