Like, record a pattern in a loop. When the pattern is recorded and saved in some pad, how can I edit the pattern with some effects?

...or add more sounds to the same pattern? is there a way to do it?

Once your pattern is playing, press the small "pattern" button again. This will toggle you back so you can play pads and add fx while your original pattern/sequence is still playing.

the pattern select button?

Nothins happens