The sound quality on submitted assignments is very poor. It is impossible on most recordings to evaluate the tone quality of the student performances. The recordings also vary greatly in terms of what actually arrives to my SM. Sometimes I hear the accompaniment, sometimes not. Sometimes there's no audio at all.
I'm sure this has to do with the wide variety of devices/machines and microphones. Nevertheless, it's tough to sit in a parent conference and tell a parent their child's tone quality needs improvement when my hard data is a poor recording on SM.