EQ & save DSD files

For PCM, Audacity can do that.

For DSD, it's tricky. I'd suggest DSD -> analogue -> analogue EQ -> DSD capture. If you want realtime, then you'd need DSD -> PCM via your player software, which then makes it trivial to process with an EQ plugin, VST or other.

Also check with the developer of this software here what possibilities exist: https://samplerateconverter.com/audio-converter/list

You could also test some realtime EQ for PCM using Equalizer APO with the Peace GUI. It works well, at least with my laptop's internal Realtek audio. Your configuration may need troubleshooting if it doesn't work right away.

I'd say give Audacity a try first if you're focused on saving processed files (PCM), then test EQ APO. If the latter doesn't work right away, then try enabling the so-called 'experimental' features or check the troubleshooting wiki.
 
Load your file, then Select All the wave content, then Tools -> Graphic EQ.

I believe this is not as versatile as EQ APO + Peace but it does an OK job for processing and saving the audio file.

Maybe there's a way to add a better plugin to Audacity but I haven't tried this.
 
They have to be converted to PCM.

You don't have to.

You can but it's better to treat DSD in the analogue domain IMO and capture that with a DSD recorder. Treat it as analogue.

There are some editing packages which do DSD editing by converting the edited portion to high-rate PCM then re-convert to DSD after editing. There is a reason they don't convert all of it to high-rate PCM. These are expensive software. Sonoma is one of them.
 
Load your file, then Select All the wave content, then Tools -> Graphic EQ.

I believe this is not as versatile as EQ APO + Peace but it does an OK job for processing and saving the audio file.

Maybe there's a way to add a better plugin to Audacity but I haven't tried this.
I don't have Graphic EQ in Tools
 

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Try two menu items to your left... My mistake, I should have said 'Effects' instead of Tools.

I believe I was looking at Tools for the 'Add/Remove plugins'. If you look into it, you'll see that you can enable or disable individual default plugins. There should be a way to add external plugins in the relevant Audacity plugin directory and then access these in the interface.
 
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.