Applies to: Scarlett 2i4 1st Gen and Scarlett 2i4 2nd Gen
As described in the Scarlett 2i4's user guide, this dial 'lets you set your monitor mix as a balance of the input signal(s) and the DAW playback'.
In practice, this means that when set fully to the left (INPUT), only the signal arriving at the Scarlett 2i4's two inputs will be heard out of the Line and Headphone outputs. When set all the way to the right (PLAYBACK), only the signal coming from your Mac/PC will be heard.
Of course this then means that when set in the middle (i.e the 12 o'clock position), you will hear a 50/50 mix of both the INPUT and the PLAYBACK signal.
What is the benefit of this dial?
- In a recording scenario, it allows the user to get the right balance between his/her input signal and the backing track.
What problems can it cause?
- Lets say you have a recording program open and have created an audio track to record on to. Typically, the track will be configured to 'input monitor' the incoming signal - meaning the incoming signal is sent back out to the 2i4 during the recording take for monitoring purposes. If the INPUT/PLAYBACK dial is set in the middle, you will be hearing this signal twice; one directly from the 2i4's input (INPUT) and second coming back from the computer (PLAYBACK). To resolve this, set this all the way to INPUT or all the way to PLAYBACK.