Seeing a week of home practice in five minutes
A lesson sees one hour. The rest of the week — where the habits actually form — happens without you.
Every teacher knows the shape of it. You spend a lesson untangling one thing — a shoulder that lifts before the fast passage, a jaw that sets when the reading gets dense — and the student leaves with it loosened. Then six days pass. They practise at home, alone, and whatever happens in those days is invisible until the next lesson, when you find out whether it held.
The hour you see, the week you don't
Most of practice is unwitnessed. That isn't a flaw in teaching; it's the structure of it. The lesson is a sample — one hour out of the week's five or ten — and you extrapolate the rest. A session file narrows that gap. When a student records a practice at home and exports it, what you open isn't a video and isn't a recording of the room. It's a quiet log of what the body did: where the shoulders rose, when the jaw tightened, how the timing drifted as they tired.
What the file shows
A timeline, second by second. A curve for posture, one for the jaw, one for the audio. A row of markers where something happened — a shoulder lift at 4:12, a stretch of unusual calm between minute seven and twelve, the head drifting toward the stand as the passage got harder. None of it is a grade. It's the same small things you'd catch standing behind them, laid out so you can scroll through a week in the time it takes to drink a coffee.
Reading it in five minutes
You don't watch it in real time. You scan the curve for the peaks, click the markers that matter, and read the one-sentence observation attached to each. The moments that need you stand out; the long calm stretches reassure you without needing a word. Five minutes in, you know how the week actually went — not how the student remembers it, which is usually rosier or harsher than the data.
What you do with it
You drop a comment on the moments worth a comment — "this is the shoulder we talked about; it came back here" — and send the file back. The student opens it, sees your note pinned to the exact second, and the lesson continues between lessons. No video of their bedroom, no account, no upload to anywhere. Just the body-state of a week, handed back and forth.
A lesson teaches the hour. A session file lets you teach the week — without being in the room for it.
It doesn't replace the lesson, and it isn't trying to. It just closes the blind spot a little: the six days nobody was watching become six days you can glance at, calmly, before the student sits down again.