MP3DJ PRO - Multi Sound Card music mixing Dj Software PRO
It will play songs and mix them together in the most simple way. Don't worry about doing complex settings only four settings are needed: Transition Type, Transition Time, Cut First and Cut Last seconds of each mixed song.
+PLUS the interesting feature of using more than one sound card in the same computer.
MP3DJ PRO can playback playlists in diferent sound cards, so more than one window of the program can be running at the same time.