Controlling SMSL C100 volume with mac

[Zgrado1970]

I apologize if this misses the point of your question, but can you use a keyboard shortcut in your player?

 

[staticV3]

How did you update your firmware of the PO100 Pro?

I didn't.

I updated the firmware on my PO100, and that removed UAC2 volume.

IIRC, SMSL posted the download link on one of their official social media sites, and I think it was also up on the SMSL homepage.