Traditional digital reverbs use Infinite Impulse Response (IIR) filters, which feedback signals into delay lines. While processor-efficient, IIR reverbs can sometimes sound metallic or unnatural.
For lead vocals, you want a reverb that adds depth without pushing the singer to the back of the stage. waves h reverb
H-Reverb uses an advanced FIR engine. It synthesizes a high-density impulse response from scratch based on your parameters. This provides the best of both worlds: waves h reverb