Comment 3 for bug 829538

Mixxx needs features like this program that currently runs with Winamp, I have tried it and was amazed at its cross-fading abilities.

http://www.sqrsoft.com.ar/index.php

Crossfade - Adjustable working range, 0% to 100% of the mixing buffer, initial(fade-in) and final(fade-out) level control.
Crossfade curve control (non-lineal)
Individual setting for normal crossfade, fade-on-skip/stop and fade-on-seek.

Signal analyzer - It allows crossfade point shifting by signal level. Trigger level from -1dB to -60dB.

Gap Killer - Adjustable trigger level from -6dB to -60dB. Individual settings for rise and fall edges of the track.
Smooth cut to prevent clicks on some tracks with high DC bias offset.

It automatically puts the beats over each other and sounds flawless