it is, but it’s the one that had the tendency to bloat to 1gb.
here are some other commands (might need to cd ~ between them):
du -m --max-depth 1 | sort -rn: shows us the size of all your folders
ls -lahS ~/dust/audio: shows us audio files
ls -lahS ~/dust/audio/tape: shows us TAPE files
please email results to help@monome.org ?
edit: closing the public loop, there was a rogue large audio file!