Hi guitpic1,
please make sure that the R3 Split Point is set one semitone higher than the Style and Left Split Points. Then R1, R2 and R3 can be played together. (They must be all switched ON by the PART ON/OFF switches, of course.)
Example (standard Split Point setting):
Split Point Style = F2
Split Point Left = F2
Split Point R3 = F#3
Best regards,
Chris