If you are looking for a sound effect or preset (e.g., "a crack top stereo sample"), you might be searching for:
Disclaimer: If your device is under warranty, contact Native Instruments support before attempting any self-repair, as opening the unit will void the warranty.
If you own a Native Instruments Traktor Kontrol S1 (or similar units like the S2/S4 series), a cracking sound or a physical crack in the plastic chassis is a known issue often caused by heat and tension.
Even pros misuse stereo wideners. Avoid these: