I Use XMPlay it is first a Player for IT,Mod,XM whatever Soundformat, you can select under Options "Output" then change this to LAME Encoder. You have to download the FREE Lame Encoder then all Songs you play will transform into MP3 and faster as normal Playback, it is like 3-4 Times Faster. You can add some effects like reverb or EQ and it makes very nice Mp3 of Amiga Mods and a little more "modern" with small use of Effects. Just dont overdue it
