DIY Metronome app using Javascript

Perfect, thanks Christian. I'll play with that and see what I can come up with.

Hi Christian, I have had limited success with this metronome script, and I'm not getting anywhere with AI. However I do have a working metronome, it's just the timing of it is nowhere near correct (way too slow and seems to be slightly irregular).

I found a reference webpage that uses a kind of look-ahead function to improve the timing, but I don't think I've incorporated it fully/correctly.

Could you have a look and give me any pointers?

// Set up metronome variables
const bpm = 120;
const intervalSecs = 60 / bpm;
const soundFile = "/System/Library/Sounds/Tink.aiff";

// Timing settings
const scheduleAheadTime = 0.1;    // How far ahead to schedule audio (seconds)
const scheduleInterval = 0.025;    // How frequently to call scheduling function (seconds)

// Check global state for metronome status
if (!globalState.metronomeOn) {
    // Start metronome
    globalState.metronomeOn = true;
    
    // Calculate initial timing
    const startTime = Date.now() / 1000; // Convert to seconds
    let nextNoteTime = startTime;
    let currentNote = 0;

    sf.engine.runInBackground(() => {
        sf.system.exec({
            commandLine: `while true; do 
                afplay ${soundFile} && sleep ${intervalSecs}
            done`,
            executionMode: 'Background',
        });
    });

    log("Metronome started at " + bpm + " BPM");
    log("Beat interval: " + intervalSecs + " seconds");
    log("Schedule ahead time: " + scheduleAheadTime + " seconds");
    log("Scheduler interval: " + scheduleInterval + " seconds");

} else {
    // Stop metronome
    sf.system.exec({
        commandLine: "killall bash",
        executionMode: 'Background',
    });
    globalState.metronomeOn = false;
    log("Metronome stopped");
}