[nabla9]

    let amp = 0;
    const maxamp = 0.5;
    const freq = 880;

    function loop(numFrames, outL, outR, sampleRate) {
        const steps = sampleRate / freq;
        const delta = maxamp/steps;
  
        for (let i = 0; i < numFrames; i++) {
            amp += delta;
            outL[i] = amp;
            outR[i] = amp;

            if (amp > maxamp) amp = 0.0; 
         }
    }