How to Get Started with XR Piano [For Casual Players] A Relaxed Beginner's Guide
Tomo
XR Piano
How to Improve Keyboard Recognition Accuracy in XR Piano!
Tomo
For those struggling with issues like “my XR piano note guide drifts away from the keyboard” or “it doesn’t seem to recognize the keys I’m pressing correctly.”
In this article, we’ll take a detailed look at how keyboard recognition accuracy works in XR piano, along with the settings and environment setup that help improve that accuracy.
Contents
What Is Keyboard Recognition in XR Piano?
Keyboard recognition in XR piano refers to the process by which an MR (Mixed Reality) device’s cameras and sensors detect a real keyboard, allowing the virtual note guide to be displayed accurately overlaid on top of it.
The higher this recognition accuracy is, the more precisely the note guide aligns with the real keyboard. Conversely, when accuracy is low, problems can occur such as the guide appearing misaligned, or the notes you play not being correctly registered by the app.
Understanding the 2 Stages of Recognition
There are two stages to recognition in XR piano: ① spatial recognition (using the camera to detect the keyboard’s position and angle) and ② MIDI recognition (receiving which key was pressed, when, and at what intensity, via the MIDI signal). When these two work together accurately, you get a highly precise note guide.
3 Factors That Affect Recognition Accuracy
FACTOR 01
Calibration accuracy
The accuracy of the keyboard position alignment (calibration) performed when launching the app is the single biggest factor affecting note guide misalignment. The more carefully you do this, the higher your recognition accuracy will be. You’ll need to redo this each time you restart the app.
FACTOR 02
Stability of the MIDI connection
If the MIDI cable connecting your digital piano and Meta Quest 3 is unstable, dropped notes or delays in keystroke data can occur. Make sure the USB-MIDI cable is plugged in firmly all the way, and secure it so it doesn’t come loose while you play.
FACTOR 03
How well the headset fits
If the headset shifts position, your viewpoint shifts too, making the note guide appear misaligned with the real keyboard. It’s important to secure the head strap firmly so the headset doesn’t move while you play.
Tips for Accurate Calibration
Calibration is the single most important step in determining XR piano’s recognition accuracy. Keep the following points in mind when performing it.
Calibrate while facing the keyboard head-on
During calibration, sit directly in front of the keyboard, in the same position you’ll use while playing. If you register the position from an angle, the guide will appear misaligned when you play from straight on.
Precisely mark both ends of the keyboard (lowest and highest notes)
Sigure’s calibration process has you mark the positions at the edges of the keyboard. Even being off by 1–2 keys when marking these positions will throw off the entire note guide. Be sure to tap precisely with your fingertip.
Make calibrating before every practice session a habit
You’ll need to calibrate every time you restart the app. Once you’re used to it, this only takes 10–30 seconds.
Hands-On Advice from the Sigure Development Team
After pressing the keyboard with your left and right index fingers, you can manually fine-tune the calibration. Check out 0:30–0:42 in the video above.
Troubleshooting Low Recognition Accuracy
If you’re experiencing “the notes drift even after calibrating” or “the keys I play aren’t being recognized,” check the following, in order.
- Redo the calibration: The first thing to try is recalibrating. Misalignment is especially likely to occur after your posture changes or after putting the headset back on.
- Check the MIDI cable connection: If the cable is partially unplugged or not fully inserted into the connector, keystroke data won’t be sent correctly. Try unplugging and reconnecting it.
- Adjust how the headset fits: If the headset has slipped down or is tilted to one side, your viewpoint will shift, causing misalignment with the guide. Refasten the strap and secure it in the correct position.
- Restart the app: Tracking can sometimes become unstable due to a temporary processing issue. Fully closing the app, restarting it, and recalibrating often resolves the issue.
Characteristics of the Meta Quest 3 / 3s’s Recognition Accuracy
The Meta Quest 3 / 3s is equipped with a spatial recognition technology called inside-out tracking. Multiple cameras on the front of the headset constantly scan the surrounding space, mapping the keyboard’s position three-dimensionally.
Thanks to this technology, the note guide continues to track accurately onto the keyboard even if you move your head while playing. Additionally, full-color passthrough lets you see your hands and the keyboard clearly, making it intuitively easy to grasp the relationship between the guide and the real keyboard.
Hands-On Review by the Sigure Development Team
Once you’ve calibrated after launching the app, you can usually keep playing without needing to recalibrate. However, if you take the headset off for a break and put it back on, you’ll need to recalibrate.
Frequently Asked Questions (FAQ)
- Q. Do I need to recalibrate every single time?
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A. Yes. You’ll need to do this every time you restart the app. Once you’re used to it, it only takes 10–30 seconds.
Q
- Q. What should I do if the notes always appear shifted slightly to the right?
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A. The keyboard position you marked during calibration may be off. Try recalibrating, and mark the two ends of the keyboard more precisely this time.
Q
- Q. Sometimes the app doesn’t seem to register the key I just pressed.
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A. This is almost always caused by a poor MIDI cable connection. Try unplugging and reconnecting the cable. If that doesn’t help, try restarting the app.
Q
- Q. Recognition seems to lag when I play fast phrases.
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A. This may be caused by latency in the MIDI connection. Be sure to thoroughly check that your MIDI cable connection is secure.
Q
If you want to start a highly accurate XR piano experience, check out the details on Sigure first.
A Message from the Sigure Development Team
The experience of “the notes drifting” can be a real source of stress while playing piano.
When trouble comes up, don’t panic — first try recalibrating and checking your cable connection. Most cases are resolved by these two steps alone.
ABOUT ME
子どもの頃に挫折したピアノを大人になってから再開したとき、最初にぶつかったのが「楽譜が読めない」という壁でした。
「もっと気軽に、楽しく練習できる方法はないか」と考え続けた結果、XRピアノゲーム『Sigure』を作ることになりました。
このブログでは、同じように大人からピアノを始めた方・再開した方に向けて、XR・ARを使った新しい練習スタイルを発信しています。難しい音楽理論よりも「まず1曲弾ける」を大切に。一緒に楽しみながら上達しましょう。
このブログでは、同じように大人からピアノを始めた方・再開した方に向けて、XR・ARを使った新しい練習スタイルを発信しています。難しい音楽理論よりも「まず1曲弾ける」を大切に。一緒に楽しみながら上達しましょう。
