When recording, the waveform looks weird, and in the weird area (the beginning of the audio clip), there is a F#5 sine tone, that shouldn’t be there. HELP!
I’d guess it’s a hardware problem.
What’s your setup? i.e. Are you using the microphone in your laptop?
If you are on Windows make sure Windows “enhancements” are turned OFF. They won’t generate a tone but they can cause all kinds of weird problems.
I am using the internal microphone of my headphones. I have the ‘enhancements‘ turned off. (Actually, in the screenshot, i was trying the sound quality after turning the ‘enhancements ‘ off.)
I believe this is your microphone powering up, probably the electret membrane/pickup plate capacitor being charged up. The way around it is to make sure the mic is on before starting the recording, eg by enabling monitoring (or simply making a quick recording, waiting until the signal stabilizes, and only then starting the actual recording)
I see this a lot e.g. when pressing the phantom power button on my USB soundcard or mic.
It is, as the solution states, the mic powering up. Your mic probably only accepts phantom power, or it had no batteries inserted, so until phantom power was activated, the mic was giving zero output, then there was a convex curve then the mic began functioning. I’d recommend increasing the amplitude dial on your soundcard btw but that’s me being nosy and knowing nothing about your goals.
By the way, you may notice the opposite occurring if you insert another phantom powered mic without the external soundcard’s phantom power switched on - there might be residual power left in the soundcard which activates the mic, giving you about 10 seconds of visible waveform before it dies out and fades into silence. This was very confusing for me before l realised what had happened.
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