You can also detune the part you want in the keyboard without using the YEM, select a part R1, R2 or R3....simply touch R1 in main screen, then Menu, then Voice Setting then in the drop window gives you a choice of 3 things you can change:
In TUNE you can use Tuning you go per say 50cents, or the amount you wish, you can also change the Octave from -2-1-0+1+2 of each of the parts and finally the portamento range you wish to have.....
I that page also have Voice Set Filter and also S.A.2 and Arpeggio
My 2 cents.