Hello,
I have a WIndows 10 PC, and am using the latest version of Equalizer APO with Peace, Foobar2000 and Topping E30 DAC and L30 amp .
For Equalizer APO to work with Foobar2000 I had to go into Menu>File>Preferences>Playback>Output>Device and change to "Default - Speakers (2-Topping USB...