I connect my 110v Yamaha MOX6 adapter to a 220v AC, is there any damage for Keyboard?

I have purchased a Yamaha MOX6 synthesizer from US, which is having a 110v input adapter, but I connect it to a 220v AC. Is there any damage for Keyboard or the damage will only go for adapter. Please help me, because of my excitement, I didn't check the cautions and security tips. When I connect and try to play, the keyboard turn on, no sound, no smoke, nothing abnormal happened, the voice is ok, but volume is low and the drum and rythm sound is not clear also. Please give me the details you know, thank you all.