In musical websites, modern HTML requires .ogg (can be .oga) song format. When exporting multiple tracks from a .cwf to "audio" .wav or .mp3, no problem, but when exporting to .ogg, which generates .oga (Vorbis), sometimes the file has a lot of dead space at the end. For example, on my website: jarmstro.com the first song - Forevermore - is over at 2:52 but the track keeps going until 4:28, which is nearly twice as long as the actual song.
There are no tracks (audio or midi) in the .cwf that extend much beyond the 2:58 play time length.