This worked great!! Thanks, Lukas!
Does anyone have a working EQ plug-in? The stock sound, especially with headphones, seems a little flat compared to my iPod with a Wolfson DAC and it might be nice to fine-tune it a bit.
I tried these instructions but was unable to get them to change the sound (or at least I can’t tell if the settings make a difference):
https://scribles.net/enabling-equalizer-on-raspberry-pi-using-alsa-equal-plugin/