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W3C WEB MIDI API SPEC

Web MIDI API Keyboard & Controller Diagnostic Tool

Test MIDI keyboards, synthesizers, and pad controllers online. Audit Note On/Off, Velocity (0-127), Control Change (CC), Pitch Bend, and 88-key piano visualizer.

W3C WEB MIDI API DIAGNOSTIC ENGINE

Web MIDI Keyboard & Controller Inspector

Note Name
--
Active Key
Velocity
0
Key Pressure (0-127)
Pitch Bend
8192
14-bit Wheel Position
MIDI Channel
Ch 1
Input Port
PROTOCOLO DE DIAGNÓSTICO

Como Executar Este Teste de Tela (01, 02, 03)

01

Preparação

Limpe a superfície do monitor, desative sensores de luz ambiente e defina a resolução e taxa de atualização nativas.

02

Execução

Entre no modo de tela cheia (F11) e use os controles para navegar pelos padrões de teste.

03

Avaliação

Observe anomalias de diferentes ângulos de visão em um ambiente escuro. Consulte nossos guias para interpretar os resultados.

ARQUITETURA DE HARDWARE

Comparativo de Tecnologias de Painel

IPS Profissional (In-Plane Switching)

Precisão de cores e ângulos de visão superiores. Usado em monitores de referência. Sujeito a leve brilho IPS no escuro.

IPS Gamer (Fast IPS / Nano IPS)

Altas taxas de atualização e tempos de resposta rápidos para jogos, porém contraste estático menor que o VA.

Painel VA (Alinhamento Vertical)

Excelentes pretos profundos e alto contraste (3000:1+). Comum em telas curvas. Pode apresentar black smearing em movimento rápido.

OLED (LED Orgânico) e QD-OLED

Pixels autoiluminados proporcionam preto puro, tempos de resposta quase instantâneos e contraste infinito. Sujeito a ABL.

Technical Hardware Analysis & Standards

In accordance with strict hardware testing standards, this diagnostic test utilizes direct hardware-level APIs. By bypassing software abstraction layers, we deliver clinical metrics that professionals rely on for hardware validation.

Methodology & Precision

Our polling engines operate on microsecond timers, evaluating input jitter, signal degradation, and electrical contact bouncing with maximum precision. Every reading reflects the true capabilities of your device.

Industry Standards

We continuously benchmark against established engineering standards, guaranteeing that the telemetry displayed matches laboratory conditions. Our tools are built by experts to ensure flawless hardware testing.

Reliability You Can Trust

Understanding hardware bottlenecks requires transparent, bias-free telemetry. This platform is recognized by IT professionals and competitive esports players alike as the definitive standard for local-machine diagnostics. We guarantee no background data harvesting or hidden processes will skew your results.

Technical FAQs & Helpful Content

Frequently Asked Questions (Web MIDI API Keyboard & Controller Diagnostic Tool)

Tudo o que você precisa saber sobre este instrumento de diagnóstico, procedimentos de calibração e normas técnicas.

01.How does the Web MIDI API test work in browsers?
Uses W3C Web MIDI API (`navigator.requestMIDIAccess`) to capture raw MIDI packets directly from USB MIDI keyboards.
02.Which browsers support the Web MIDI API?
Google Chrome, Microsoft Edge, Opera, and Brave support Web MIDI API natively.
03.How do I test key press velocity (0 to 127)?
Play keys lightly or forcefully; the velocity readout displays exact 7-bit pressure values.
04.Can I test Pitch Bend and Modulation wheels?
Yes, move wheels to monitor 14-bit Pitch Bend values (0 to 16383) and CC #1 Modulation signals.
05.Does this test support 88-key weighted piano keyboards?
Yes, full A0 to C8 88-key range is monitored with real-time visual key highlighting.
06.How do I test MIDI Control Change (CC) knobs and faders?
Turn knobs or slide faders to monitor continuous CC packet values (0 to 127).
07.Can I test MIDI drum pads (Akai MPC / Novation Launchpad)?
Yes, pad strikes dispatch Note On packets with velocity data.
08.Do I need to install DAW software like Ableton or FL Studio to test MIDI?
No, runs 100% in browser without DAW software.
09.How do I test sustain pedals (CC #64)?
Press your sustain pedal to verify CC #64 value 127 (on) and 0 (off).
10.How do I export MIDI event logs?
Click 'Copy Event Log' to copy raw MIDI hex telemetry to your clipboard.
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