rikrak
2
Are you asking why it is necessary to set the Sources in the Rec Setup Menu?
This is because it is possible to sample multiple ways.
When you press Track + Midi, you could sample from any Track Input. Furthermore, it is possible to Sample from AB and Src3/CD at the same time.
Also, you can plock Record Trigs on a single pattern to different Rec Inputs, depending on which Inputs are activated for that Track’s Machine.