Sujet Piste décalée à l'enregistrement (audio)

Recording Latency Compensation is when the program adjusts the position of the recorded audio according to the current latency. Here's how it works:
If you're recording audio and are not monitoring through Reason (e.g. monitoring directly through the audio card or via an external mixer), the audio you record will reach the program slightly late. This is because you play along with background tracks or the metronome - and you hear these delayed by the output latency. Also, the sound you record is sent to the program via the buffers in the audio hardware - it is delayed by the input latency.
Reason compensates for this by moving the recorded audio earlier by the sum of the input+output latencies. This compensation is also done in "Manual Monitoring" mode, if Monitor was Off for the recorded track (when you started recording).
If Monitor is On, there is no Recording Latency Compensation. This is because the monitored sound will also be delayed, and numerous tests have shown that the performer will actually play slightly ahead to compensate for this. In other words, when monitoring through Reason, the performer is expected to do the Recording Latency Compensation himself/herself.
If you are monitoring via an external mixer, and have selected “External” in the Monitoring section on the Audio tab in Preferences, there might be situations where you experience that the recorded audio is generally played back too early - or too late - in the song. This could be because your audio card doesn’t actually have the latency values it reported to Reason.