I store all of my music in Vorbis 192kb/s (+FLAC on DVD) and convert it to MP3 for my portable DAP.
FLAC -> OggDrop -> Ogg, Ogg -> LAMEDrop -> MP3.
LAMEDrop with LAME 3.97 works pretty fine, but new version (LAME 3.98 beta 6) produces mp3 with periodic noise instead of music.
