u have to do 2 audio tracks and route the output of the one u r putting autotune on to the input of the 2nd audio track and record the input signal on the 2nd track…in this way u have 2 advantage:1 track with autotune as insert so u can adjust later - 2 u have a track with autotune printed
if u dont want to record on the track with autotune as insert just enable the monitor button without arming the track & enable the record on the 2nd track without the monitor button so u dont have feedback which can disturb the singer