Excellent project, also serves to provide some quick audio latency test for devices. Quality of playback seems to vary between browsers and devices (DDG/FF -Android); I presume it's consistent and better in iOS devices as it's known for better audio latency(Don't have one nearby to test).

If the author is reading this, Would love to hear about the quirks related to audio playback in browsers/devices you've found so far in developing this.