You can convert little mp3- or wav-loops to sth. like .Mod, .s3m etc... Just repeat a 20second-wav-loop in mediumquality (filesize ca. 1.8mb or sth like that) a few times, and you got a 3minutes-Module-file in good quality and an ok-filesize...
But I think its really easier to learn making Music in Modplug...
so, best wishes for ya songs, Crimi