The only way I could find to convert atp files to MP3 or WAV:
-play your atp files on a Sony Walkman
-plug your Walkman in your sound card, line in, through a jack
-download MP3myMP3, freeware ( you might do that first and you won't regret it, works great )
-record through source: stereo mix or line in
-save either in MP3 or WAV
It's not that difficult and I got excellent results.
If anyone has a better idea????