In Performance Play Mode F2 is A/D. These are the setting for the A/D input which can be either line or microphone. You can add Reverb, Chorus and the Variation effect and set the overall level.

In Pattern and Song Mix mode, F2 is also A/D and has the same settings. So it is pretty easy to add effects to your vocals, You can also on the same page set the vocals to be routed to an individual analog output. The individual outs are dry as it is expected that you want to process the separate output on it's own.