The styles OTS is sometimes set this way. The idea is that you may be using Right One and Two with Harmony Echo on to give some lush strings or orchestral sounds but then want to bring in a solo instrument quickly by just pushing the right three button you can do this.
Hi Eileen,
One Touch Settings (OTS) of Styles CANNOT change split points. However, if (for some reason) the R3 split point was already "wrongly set" BEFORE (i.e. higher than just a semitone above the Left split point), the OTS-related behavior you describe can occur.
If initially R3 part is still OFF, the R3 split point is also OFF, i.e. R1&2 parts sound normal (layered). If R3 part is then switched ON, the "wrongly set" R3 split point is re-activated, and the R1&2 parts now sound only in the keyboard range
between Left and R3 split point (which may be only one or a few keys under certain circumstances). This makes it seem as if switching on R3 parts R1 & 2 are "muted".
By the way, if R1&2 are on and R3 is off, I just use three fingers to simultaneously press all three Part On/Off buttons (R1+R2+R3). This way, with "one movement" R3 is switched on and at the same time R1&2 are switched off.
Best regards,
Chris