EQ & save DSD files

Yes, I do it often. There are two ways.
  1. Make your output the "Disc Writer" This will write to a wave file instead of playing back from the sound card
  2. Convert Format. I often use this and just choose a different lossless codec or save it in a new folder.
Be sure that you have applied DSP to your stream. In the Convert process it is dialog separate from the playback DSP.
 
Just move the sliders for each corresponding EQ frequency up or down: positive dB is up, negative dB is down from centre.

Yep, that's the one.

To go further than that, have a look at EQ APO, where each filter type itself can be selected (way more flexible). However, this is mostly for realtime EQ and listening. There may be a way to re-capture that too.
I downloaded EQ APO & like it, if you know a way to capture & save the files please let me know?
 
Saving the EQ curves is one thing.

Saving a processed file may be a bit more convoluted as this setup is normally used for realtime processing. On Linux, there may be a way with Jack, but I don't know the details here.

For offline processing, you're better off with Audacity and either the Filter Curve EQ Effect or the Graphic EQ effect (or installing a third party VST plugin). Load in the file, Select All, then process, then Export it as WAV again.
 
Filters done, I need to know how add files and how to EQ & save?
 

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Filters done, I need to know how add files and how to EQ & save?
It's not really made for that: it's for realtime DSP, i.e. while you're listening to your music.

Doing the processing and save with this would require additional steps and configurations (e.g. with JACK).

I'd say keep this for listening to audio files which have not been pre-processed because if that works, you don't really need to pre-EQ them, right?

For the EQ + Save, then use Audacity if you really want to do that. Here, I'd say, there's no need because you can use EQ APO + Peace to apply the EQ realtime => you save time, as the preprocessing of audio is then unnecessary. Imagine having to re-process all your files with different headphones every time you get a new one - not practical.