On Tuesday, 5 May 2020 18:34:29 BST Mark Knecht wrote:
> On Tue, May 5, 2020 at 9:38 AM <[email protected]> wrote:
> <SNIP>
> 
> > Background to my question:
> > I am still searching for a equalizer solution, which does not
> > uses the eq provided by the hardware (I am using a DAC, which
> > does nothing else, than converting PCM into an analog signal.
> > No processing whatsoever.
> > 
> > So the eq has to have some sort of DSP funktionality build in.
> > 
> > And it should be made for background processing.
> > 
> > Anu helpful alsa-based idea is very appreciated...
> > 
> > Cheers!
> > Meino
> 
> pulseeffects possibly? I've never used it.
> 
> Good luck,
> Mark

I use FF-68.7.0-r1 with USE="-pulseaudio" and it works fine producing sound.

There's this equaliser for alsa, but I haven't used it myself:

$ eix -l alsaequal
* media-plugins/alsaequal
     Available versions:  
       ~    0.7.1       [ABI_MIPS="n32 n64 o32" ABI_RISCV="lp64 lp64d" 
ABI_S390="32 64" ABI_X86="32 64 x32"]
     Homepage:            https://github.com/bassdr/alsaequal
     Description:         A real-time adjustable equalizer plugin for ALSA

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