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On Mac, Shift Option Volume down lets you do quarter increments. This opens up 3 lower volume options between 1 and off.

You can go even further if you open the MIDI settings thing (I don’t remember the exact name, it’s in Utilities).

There you can set the per channel volume with 2 digits, giving you 10 steps extra between 0 and 1, as well as balance.

I did. I have an "Asus Zenfone Max Pro M1" (what a mouthful) and the volume is always too high and the audio ridiculously bad at "low" volumes. Changing some values with ALSA makes it almost bearable. The easiest way I found to do that was to root the phone, compile tinyalsa in termux and use this script to call tinyalsa with root:

https://pastebin.com/5f1jwpkb

If anyone has ideas how to do this without root, get around the issue of calls being lower volume or remove the dependency on tinyalsa and termux, I'm all ears.

SoundAssistant on Samsung devices lets you do this as well. It gives you per-app sliders which stack with the main slider allowing you to go below 1% -- or whatever number rounds to "off" on your headphones.