For a natural sound, keep the Speed around 15–25ms. For the "T-Pain" effect, crank it to 0.1ms.
Excellent for that "hard-tuned" robotic effect and very light on CPU. waves tune real time crack plugin fixed
If the budget is zero, don't risk your system's safety. These "fixed" alternatives provide similar real-time results for free: For a natural sound, keep the Speed around 15–25ms