It’s still possible to use pulseeffects with pulseaudio
Note for users that did not moved from Pulseaudio to PipeWire
From version 5.0.0 onward PulseEffects needs PipeWire. Pulseaudio users need to instal one of the 4.x releases or building a package directly from our legacy Pulseaudio branch https://github.com/wwmm/pulseeffects/tree/pulseaudio-legacy. Arch Linux users can also use the PKGBUILD on the same branch. This branch will receive updates for critical bugs as time goes by. So if PipeWire is not for you yet it is fine to use the legacy branch.