p5.sound's midiToFreq() allows microtonality (decimal MIDI notes)

[thrly]

Most appropriate sub-area of p5.js?

• Accessibility
• Color
• Core/Environment/Rendering
• Data
• DOM
• Events
• Image
• IO
• Math
• Typography
• Utilities
• WebGL
• Build process
• Unit testing
• Internationalization
• Friendly errors
• Other (specify if possible)

p5.js version

1.11.1

Web browser and version

Firefox 133.0.3

Operating system

Windows 11

Steps to reproduce this

Steps:

1. Decimal numbers in midiToFreq() return microtonal values, because they're not rounded first.
2. This is actually a pretty cool feature, and allows some creative possibilites (microtonal music!), but it might be unexpected for some because the reference implies the value should be an integer MIDI note number:

General MIDI treats notes as integers where middle C is 60, C# is 61, D is 62 etc. Useful for generating musical frequencies with oscillators.

Rather than 'fix' this, adding a note to the reference description along the lines of 'Decimal values return microtonal frequencies.' Might clarify that those values won't be rounded to equal temperament tuning, but keep a pretty cool, if unexpected, feature?

Snippet:

  console.log(midiToFreq(60)); // returns 261.6255653005986 (Hz) = C4
  console.log(midiToFreq(60.5)); // returns 269.2917795270241 = C4 quarter-sharp!
  console.log(midiToFreq(61)); // returns 277.1826309768721 = C#4

I'd be happy to add this note to the reference if it's accepted.

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