So to switch the whole unit to SC-55 map one needs to press ALL and SC-55 MAP, but in the manual it says that the switch back to SC-88 map is performed by pressing SELECT+SC-55 MAP together so that the button blinks. Can someone enlighten me on what the exact difference between that and simply pressing the button again (light off) is? I found that with factory defaults the unit can't play some MIDIs properly and gives a "No INSTRUMENT" or "No DRUM SET" message, but those work with SC-55 MAP either on or blinking.