I recently completed the arrangement of a 2:50 mins music project. When I exported its audio mixdown in WAV format, the ouput was perfect. However, when I am exporting the output in mp3 or wma format, the length strangely increases to 5:40 mins and the tempo of the music obviously becomes extremely slow. When I tried to convert the WAV output into mp3 by a free MP3 converter, all I could get was disturbance.
Please help me out of this strange problem!