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I think manually editing /boot/config.txt might be the corrrect solution.
You should try to comment out hdmi_force_edid_audio=1 in config.txt, add/uncomment hdmi_ignore_edid_audio=1 option, then reboot and try amixer again.
Also you can check option hdmi_drive:
hdmi_drive=1 Normal DVI mode (No sound)
hdmi_drive=2 Normal HDMI mode (Sound will be sent if ...
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Does you monitor actually have speakers? I have a number of Acer monitors; of those one has an HDMI input but no speakers and there is no volume control in the settings.
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The quality of the output jack is not the greatest even with an amplifier or headphone that can take the line line level output (it also has an odd software pop and been known to miss the first second or so of sound).
Quality is greatly improved by using a I2S HAT that outputs either line level or headphone level signal for you but it does obviously increase ...
1
I wouldn't trust a lossy format such as MP3 to represent a signal with 100% accuracy. Even if the original signal you encoded was absolute silence, it may no longer be the case after MP3 encoding due to rounding errors, filtering artifacts, etc.
For PCM files it's easy to check if the data stream is filled with zeroes or not. Unless you're 100% sure you're ...
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Because windows using data dithering. So the 0 is not zero but -1; -2; 0; 1; 2;
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