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Purpose Gradual and sudden perturbations of vocal fundamental frequency (fo), also known as adaptive and reflexive fo perturbations, are techniques to study the influence of auditory feedback on voice fo control mechanisms. Previous vocal fo perturbations have incorporated varied setup-specific feedback delays and amplifications. Here, we investigated the effects of feedback delays (10-100 ms) and amplifications on both adaptive and reflexive fo perturbation paradigms, encapsulating the variability in equipment-specific delays (3-45 ms)