While Traktor Pro 3.2 was a turning point for harmonic mixing, the platform has since moved on. Native Instruments recently launched Traktor Pro 4, which includes high-end technology powered by iZotope RX and Flexible Beatgrids for tracks with changing tempos. If you're interested, I can help you:
This specific update introduced several tools designed to help DJs mix in key seamlessly: New Time-Stretching Algorithm : Integrated Elastique 3.3 for better audio quality when changing tempo or pitch. Harmonic Mixing Widget Traktor Pro 3.2.0.60 incl Patch - CrackingPatching