Whistle Synth: Control a Synthesizer by Whistling, Now on the Mac App Store

Whistle Synth: Control a Synthesizer by Whistling, Now on the Mac App Store

Jeff Kaufman's whistle-controlled synthesizer is now free and open source on the Mac App Store. The app, which lets you play music by whistling into a mic, has been dramatically improved with help from Claude: latency dropped from 80ms to 5ms, stuttering is gone, and it now offers a variety of bass voices plus a treble drawbar organ. Kaufman details how he used AI to refactor the code, design voices, and even navigate Apple's app review process.

This is a good example of AI as a complement: I was never going to get around to doing any of this if I needed to write it all myself.
  1. cousin_it

    The first time I saw it, I thought about playing a drumkit and whistling a bassline at the same time, with someone else on guitar and vocals, making a full rock sound with two people. But then I was too lazy to try it.

  2. n738

    This is something I think about making every time I sit in front of my PC - thank you and I look forward to trying it!

  3. comradesmith

    It seems like it will be fun but my headphones just come in under the activation threshold, but I can't see a way to add some input gain

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2026-09-07