Meet Chopy, the music assistant

Chopy is the assistant for your transcriptions. It analyzes and edits your sheet music, in the sheet music editor, and your MIDI, in the piano roll. You write in one sentence what you want to know or change:

• a question, like “What key is this piece in?” or “Which passages are the hardest?”: it answers based on the notes of your piece, pointing to the measures;
• a change, like “Transpose it up a tone”: it applies it in one go. What would take dozens of clicks takes a single request, and everything can be undone.

A question or a change: a single field

There is only one field, and nothing to choose: Chopy recognizes by itself whether to answer or to edit. If your sentence asks for both, for example “transpose it to D major and tell me if it's playable on violin”, it applies the change first, then offers your question in one click: “And my question: …”.

Where do I find Chopy?

• In the editor, on computer: click Ask Chopy, at the bottom right of the sheet music, or open the Chopy tab in the right-hand panel.
• In the editor, on phone: tap the Chopy bubble, at the bottom right of the screen.
• From your sheet music page: click Chopy, between Edit and Download (on phone, the round Chopy button at the top, to the left of “···”). When it asks “A question, a change?”, write your request: Chopy opens the editor, then answers your question or applies the change before your eyes.
• In the piano roll: in the Piano roll view, click Chopy, at the top. A change request switches the piano roll to Edit mode; a question leaves it in read mode. On computer, while you make corrections, Chopy opens from the bottom of the piano roll.

Chopy asks you to be signed in. It is available in every app that opens the new editor. On DrumConvert and ScoreConvert, which keep the previous editor, it is not available yet.

What questions can I ask it?

Chopy answers questions about the open sheet music or MIDI: the key and the notes that fall outside it, the chords, the range and playability for an instrument, the difficult passages, practice tips, voice leading, the likely transcription errors. It also explains a musical notion, tying it to your piece. Its answer appears under the Analysis label, and its measure numbers are links: click one to go to that measure. A question never changes anything.

Every detail, examples and limits included: Ask Chopy a question.

Chopy only talks about the open transcription. For questions outside that scope, it answers: “I answer questions about this score and edit it. Ask me its key, for example, or to transpose it.”

What can Chopy change?

Chopy knows about fifty editor actions. A few example requests:

Chopy can also write notes: a melody or countermelody that fits the piece, on the staff and measures you specify. Fingering is calculated automatically for piano, organ, violin and double bass.

In the piano roll

In the piano roll, Chopy can do everything you would do by hand. A few examples:

As on the sheet music, Chopy writes notes in context: it first reads the targeted measures and their neighbors, on all tracks, then writes in the key, on the harmony and the rhythm of the piece. In the piano roll, measure numbers are the piano roll's: a pickup measure can shift them by one compared with the sheet music.

What happens after a change?

1. Chopy shows “Chopy is working…”, then applies the change.
2. It sums up what changed: “Done: 12 notes transposed, bars 5 to 8”.
3. Click Show changed notes: the sheet music scrolls to the first one, and all the affected notes are selected. You can touch them up right away, by hand or with a new request.
4. If you don't like the result, click ↺ Undo under the reply, press Cmd/Ctrl + Z, or write “undo”. The sheet music, or the piano roll, goes back to how it was; the request still counts toward your plan.

Before a big change, Chopy asks you to confirm: a time signature change (“Every bar will be rebuilt”) or a request that touches a lot of notes. Click Apply or Cancel.

In the piano roll too, a request to Chopy is undone in a single step, even if it touched a lot of notes. If you touched up the piano roll by hand after the request, Chopy refuses to undo it rather than erase your edit for you.

Chopy's changes are changes like any other. In the sheet music editor, click Save to keep them. In the piano roll, they are saved automatically, like your manual corrections. See Edit your sheet music with the editor.

Under each Chopy answer, in the score as well as in the piano roll, you can Copy the text and tell us whether the answer helped: thumbs up for Helpful answer, thumbs down for Not helpful. Click a second time to remove your feedback. Your feedback is saved with your request.

The sheet music and the piano roll stay in sync

The sheet music and the piano roll's MIDI are two views of the same transcription. A change made in one, by Chopy or by hand, is automatically carried over to the other:

• correct notes in the piano roll, and the sheet music is regenerated from your corrections;
• save a correction in the sheet music editor, and the MIDI and the piano roll are updated.

Velocity, sustain pedal, modulation and expression change how the MIDI sounds, but are not written on the sheet music. Track mute, solo, volume and pan are for listening: they are not saved in the MIDI.

Chopy can make mistakes. Check its answers against the sheet music, and undo a change you don't like.

Going further

• Ask Chopy a question: what it can analyze, and its limits.
• Wording your requests to Chopy: the habits that save you the most time.
• The Chopy plan: how many questions and changes per month, and what counts.
• Editor features: everything you can also do by hand.
• The piano roll: correct the MIDI by hand.