Web Audio API Tone Generator With Gain Control
This is a basic Tone Generator wrapped in a class. It uses the Oscillator node from the Web Audio API.
Notes
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Some examples show using:
gainNode.gain.value = #
Doing that can cause popping/crackling sounds on every change. It's especially bad using an input range slider.
The
setTargetAtTime()show above prevents that. It's sent the target gain, a startTime, and a timeConstant. By setting the startTime to .currentTime() the change starts to take place immediately. The timeConstant defines an "exponential approach" to the target gain. Using a low value like "0.01" make it happen fast enough that it feels instant.
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