Antares ATR-1a - Manual (Page 16)

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An Important Note About Monitoring: If the ATR-1a is used to pitch-
correct an artist’s performance in real time, it is very important that the
performer is able to monitor their original signal, not the pitch-corrected
signal. Trying to react musically to the processed signal will drive them
crazy and, in most cases, drive them farther off pitch.