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WebUI DSP options don't seem to do much..

So I just received a Pi4B 4GB, DAC+ DSP board. Hooked up the HifiBerryOS (20200908) image, added dtoverlay=hifiberry-dacplusdsp.dtbo to config.txt, loaded the "DAC+ DSP Universal V10" DSP programme. Hooked up a DAC via optical out, and at least I get some music via Airplay and Spotify Connect. So far so good.

Now in Sound -> Channels -> Advanced I can see 4 channels. However none of the sliders or buttons seem to do anything. I would expect to be able to change the volume of the individual channels.. but nothing.

In Sound -> Parametric Equalizer -> Speaker Equalizer, I can group channels and define filters, but they don't seem to have any effect.. Nothing..

Strangely Sound -> Parametric Equalizer -> Sound Design does work! Some EQ'ing there does seem to change the sound in an expected manor.

So either I'm expecting things I should not, or some settings might be wrong somewhere..

Tried # /opt/hifiberry/bin/reconfigure-players
/etc/hifiberry ~
~
pi
bluetooth
pi3orlater
arm7
dsp
localui
DAC+ DSP 1
Nothing changed, exiting...

So looks like it did find the DSP. Also tried rebooting the thing, with no avail..

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