Why can I get BEAST to load my .mp3, .aiff, .something sample files?
Import functionality for foreign sample types is always being worked on, but due to the sheer multitude of formats out there chances are that a specific format is not yet supported. However, sample file loaders have much improved in the last versions, and at this point exist for Ogg/Vorbis, MPEG Audio 1.0/2.0/2.5 Layer I/II/III, RIFF/WAVE, and .bsewave (BSE multi sample format) files.