Packages with the soxr use flag

media-plugins / audacious-plugins : Lightweight and versatile audio player

  • Build with SoX Resampler support

media-sound / qmmp : Qt5-based audio player with winamp/xmms skins support

  • Use the SoX resampling library

media-video / vlc : Media player and framework with support for most multimedia files and streaming

  • Enable SoX Resampler support via media-libs/soxr