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Undulating playback
post Feb 2 2013, 12:29
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Member No.: 106356

I play all my lossy and lossless music with Foobar2000 1.2.2. But the sound seems to be undulating, as if someone is constantly playing with the volumecontrol. Really irritating.
It seems to have started when I downloaded and integrated the equalizer. Any views on this?
Thanks in advance.
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post Feb 2 2013, 14:00
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Yes. You probably have bands equalised upwards in gain, which is causing the final signal to exceed full scale (0 dB), causing some element of the subsequent signal chain to limit the signal to avoid this, causing ‘pumping’ compression.

Click on the “Auto level” button to fix this. It decreases the gains of all bands proportionally so that none are positive. Never equalise any bands over 0 dB unless you are highly confident that (A) the entire signal was quiet enough that the EQd result will not clip or (B) the increase in overall gain from the increased frequencies will be offset by decreases at other frequencies.

This applies generally, not just to foobar2000. I accept the need for it to be possible to EQ bands upwards in some cases, but applications would do well to provide more caveats about the potential results, as questions like this pop up every few months.

This post has been edited by db1989: Feb 2 2013, 14:06
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