There's a closed pull request on the void-packages repository

PulseEffects5
https://github.com/void-linux/void-packages/pull/29638

Description:
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PulseEffects 5 only supports PipeWire, so I made a new package `pulseeffects-legacy` which will stay on the PulseEffects 4. This approach is similar to what other distributions have done. I also added an install message to pulseeffects to let users know about this change.

related issue: #29006