Certain crucial happenings inhibit the ability of others to occur

Hey there! Want to check out the live application I'm currently working on? Simply click this link: turbo_synth

This project is being developed using VueJS, however, the issue I've encountered does not seem to be related to Vue at all.

The problem: Everything seems to work perfectly fine except for certain combinations of notes. For example, try playing the keys Q, W, and then 2. You'll notice that the last note isn't being played or displayed as pressed, even though you can play Q, W, E, R, and Y simultaneously. So it doesn't appear to be a limitation issue, as I initially suspected?

The code: To make handling key events easier globally, I am utilizing vue-keypress.

Here's a snippet of the template section:

<template>
    <div id="app">
        <h1>Basic oscillator test</h1>
        <label for="waveType">Choose a wave type:</label>

...
...

...

And here's the list of available notes:

export let testBoard = {
  'C3': { keycode: 81, freq: 130.81, class: 'white' },
  ...
  ...
  ...
  'B4': { keycode: 77, freq: 493.88, class: 'white' }
}

I have also tested other piano projects created with Vue or different technologies, but a similar issue persists. I might be overlooking something crucial, but unfortunately, I haven't been able to find the required information yet.

Thank you in advance for any assistance!

Answer №1

Your code is not flawed, it's simply a hardware limitation that many keyboards face.

Imagine the keyboard as a grid layout where certain keys are grouped together in columns (such as 1, Q, A, and Z).

The issue arises when trying to press three keys that form the corners of a rectangle simultaneously. For example, pressing two keys in a row will prevent a third key in the same column from registering a press. Similarly, holding down two keys in a column will block a third key in the same row from being recognized.

This limitation is due to the electronic structure of keyboards, leading to what may seem like "ghost" keypresses. Some keyboards may display unexpected presses when multiple keys at the corners of a rectangle are held down simultaneously.

Unfortunately, this constraint cannot be addressed through software solutions as it is inherent to keyboard engineering. While there are keyboards without this limitation, it's not guaranteed that all users will have access to them.

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