Capture mode
Input constraints
Channel count
Requested mic sample rate (hint)
AudioContext
Context sample rate
ScriptProcessor buffer size
Encoding
If you hear crackles only in ScriptProcessor mode or only when forcing 16k context, that strongly suggests a scheduling/resampling issue on that device.
Tip: run the same settings twice—once idle, once while scrolling or opening other apps—to reveal main-thread sensitivity.
Device & engine info
User agent
Platform
—
—
Actual AudioContext rate
—
What the browser really used.
Mic track settings rate
—
Read from MediaStreamTrack.getSettings().
Realtime stability
Callbacks
0
Audio processing events received.
Avg interval (ms)
—
Time between callbacks.
Jitter (std ms)
—
Higher = more glitch risk.
Max delay spike (ms)
—
Worst observed stall.
RMS level
—
Input loudness estimate.
Health hint
—
—
This waveform is just a fast visual check. The more important signal is callback jitter and spike size.
Event log
The log records the chosen settings and any errors. Share this when comparing devices.